May 28, 2016

Viagra High Blood Pressure

Viagra high blood pressure I unashamedly maintain that there is so much more to being successful on the mobile web than dealing with screen size. Viagra high blood pressure But I do accept that dealing with screen size is at least a first step.

Viagra high blood pressure Thank goodness then, viagra high blood pressure that the matter of screen size is so simple and well understood.

Viagra high blood pressure Really?

Viagra high blood pressure As web developers, viagra high blood pressure we will often need to know the screen size of the device we are displaying content on. Viagra high blood pressure Perhaps on the server, viagra high blood pressure perhaps on the client, viagra high blood pressure perhaps to be used as a clause in a media query.

Viagra high blood pressure But how best to measure it? And what are we measuring anyway? On the client-side, viagra high blood pressure for instance, viagra high blood pressure a variety of ways exist to determine screen and page size: things like screen.width, viagra high blood pressure window.outerWidth, viagra high blood pressure document.body.clientWidth, viagra high blood pressure and so on. Viagra high blood pressure But these properties are infamously unspecified by any standards: so what do they all mean – and how reliable are they on mobile browsers?

Viagra high blood pressure Required reading at this point is PPK’s viewport article. Viagra high blood pressure With an article of tables from him that long, viagra high blood pressure you know something’s up.

Viagra high blood pressure But last week I pushed out an update to src.sencha.io which allows client-side screen size parameters. Viagra high blood pressure Which parameters should mobile developers use? And when?

Viagra high blood pressure

Viagra high blood pressure So for this blog post, viagra high blood pressure I looked at a range of these metrics, viagra high blood pressure and recorded their values for a variety of mobile browsers and page conditions. Viagra high blood pressure I’ve been working in mobile for far too long, viagra high blood pressure but still, viagra high blood pressure the amount of diversity in the results shocked me. Viagra high blood pressure Read on for the gory details, viagra high blood pressure or skip to the end for the TLDR. Viagra high blood pressure I think there are some interesting findings.

Methodology

Viagra high blood pressure The tests comprised a very simple web page, viagra high blood pressure containing several paragraphs of meaningless Latin, viagra high blood pressure and a JavaScript function that runs to take screen measurements within the browser. Viagra high blood pressure The following properties are sought:

  • screen.width
  • screen.availWidth
  • window.outerWidth
  • window.innerWidth
  • document.body.clientWidth
  • document.body.offsetWidth
  • @media device-width
  • @media width
  • screen.height
  • screen.availHeight
  • window.outerHeight
  • window.innerHeight
  • document.body.clientHeight
  • document.body.offsetHeight
  • @media device-height
  • @media height
  • window.orientation
  • @media orientation

Viagra high blood pressure The CSS media query properties (device-width, viagra high blood pressure orientation, viagra high blood pressure etc) are taken programmatically by evaluating expressions with the matchMedia() function, viagra high blood pressure supported in iOS v5.0 and Android v4.0.

Viagra high blood pressure I’m sorry to say that the tests were run on emulators rather than real devices, viagra high blood pressure but covered iPhone (iOS v5.0 and iOS v4.3), viagra high blood pressure Android v2.3, viagra high blood pressure Android v4.0, viagra high blood pressure and Opera Mobile v11.0. Viagra high blood pressure The Android and Opera simulators were set to use HVGA (320×480) so as to have conditions as consistent with the iPhone as possible. Viagra high blood pressure (Even though the actual physical screen of a retina iPhone is 640×960, viagra high blood pressure this HVGA resolution is the one reported to the software APIs).

Viagra high blood pressure The tests were run with two different HTML document types – HTML5 and XHTML-MP – and also a third time with no doctype specified. Viagra high blood pressure The tests were also run both with and without a viewport meta tag to control the default width (constrained to ‘device-width‘) and scaling. Viagra high blood pressure Additionally each device was tested with landscape as well as portrait orientation – making a total of 12 test combinations for each browser.

Viagra high blood pressure For the iPhone and Android browsers, viagra high blood pressure PhoneGap-wrapped versions of the test pages were also run (without the viewport meta tag), viagra high blood pressure and finally, viagra high blood pressure for iOS v5.0, viagra high blood pressure the iPhone’s ‘Add to Homescreen’ technique was used (with the apple-mobile-web-app-capable meta tag) to launch portrait versions of the tests in a full-screen mode.

Viagra high blood pressure As if all those combinations were not enough, viagra high blood pressure the properties were accessed four times during the lifecycle of the page: a) inline before the <body> tag, viagra high blood pressure b) after the </body> tag, viagra high blood pressure c) on the document’s load event, viagra high blood pressure and d) one more time, viagra high blood pressure 250ms later. Viagra high blood pressure I had a hunch that the values – at least those relating to page height – might change throughout this lifecycle.

Results

Viagra high blood pressure The full set of results is available here. Viagra high blood pressure The various combinations of conditions are across the top, viagra high blood pressure and operating systems (and measurements made) are down the left. Viagra high blood pressure Each cell shows the value returned from the relevant API call, viagra high blood pressure and ‘-‘ is used where the call failed or returned an undefined value.

Viagra high blood pressure Where the value changed during the lifecycle of the page, viagra high blood pressure slashes delimit the change, viagra high blood pressure and a letter is used to indicate at which of the four measuring points the value changed. Viagra high blood pressure So for example, viagra high blood pressure ‘208/c:1962‘ means that a value was 208 before the <body> and after the </body>, viagra high blood pressure but then it changed to 1962 for ‘c’, viagra high blood pressure the document’s load event, viagra high blood pressure and remained so 250ms later.

Viagra high blood pressure There’s a lot to digest in there, viagra high blood pressure although you may at least have noticed – as I have – that homogeneity is scarce. Viagra high blood pressure You may notice some particularly strange results, viagra high blood pressure particularly on Android, viagra high blood pressure but also on iOS and Opera. Viagra high blood pressure Let’s analyze the data by slicing the findings by property measured, viagra high blood pressure dicing by operating system, viagra high blood pressure and trying to digest the whole sorry lot.

Analysis

screen.width & .height

Viagra high blood pressure These two properties are generally understood to return the physical dimensions of the screen upon which a browser is running. Viagra high blood pressure On desktop browsers, viagra high blood pressure they will return you 1024×768, viagra high blood pressure 1440×900, viagra high blood pressure 1600×1200 and so on, viagra high blood pressure regardless of how the actual browser window is sized. Viagra high blood pressure On mobile devices, viagra high blood pressure one would expect the same behavior, viagra high blood pressure and get full physical screen sizes.

Viagra high blood pressure Well, viagra high blood pressure close. Viagra high blood pressure But no cigar.

Viagra high blood pressure Opera Mobile and Android v4.0 (as well as v2.3 in a PhoneGap app) behave most intuitively in this regard, viagra high blood pressure and will indeed report 320×480 or 480×320 for portrait and landscape respectively.

Viagra high blood pressure iOS also consistently reports the physical dimensions of the screen (320×480), viagra high blood pressure but notably fails to flip them for a change or orientation. Viagra high blood pressure So be aware that in landscape mode, viagra high blood pressure your browser’s width will actually, viagra high blood pressure apparently, viagra high blood pressure be reported to be larger than the screen’s.

Viagra high blood pressure Android v2.3, viagra high blood pressure in a regular browser scenario, viagra high blood pressure however, viagra high blood pressure displays even more curious behavior. Viagra high blood pressure Its screen.width always starts off as 800 – which is clearly some sort of virtual viewport, viagra high blood pressure rather than the physical screen. Viagra high blood pressure But when the document has an XHTML-MP doctype, viagra high blood pressure or a constrained viewport (for any doctype), viagra high blood pressure the value will switch, viagra high blood pressure by the time of the document load event, viagra high blood pressure to be the 320 or 480 you might expect.

Viagra high blood pressure Now this might be tolerable if you remember to wait for documents to fully load before accessing this property, viagra high blood pressure but even that caution is blown to the wind by Android v2.3’s screen.height behavior.

Viagra high blood pressure With a non-constrained viewport, viagra high blood pressure a portrait orientation, viagra high blood pressure and with no doctype, viagra high blood pressure screen.height was reported during this test as 1003. Viagra high blood pressure With an HTML5 doctype, viagra high blood pressure it also switched to 1003, viagra high blood pressure but only after dallying at 498 until at some point after the document load event. Viagra high blood pressure With an XHTML-MP doctype, viagra high blood pressure it also started out at 498, viagra high blood pressure but then dropped to about 40% of that value (199) by the time of the document load. Viagra high blood pressure With a constrained viewport, viagra high blood pressure behavior was stable as a function of doctype, viagra high blood pressure but also demonstrated the 60% drop at document load: from 1003 down to 401.

Viagra high blood pressure Landscape-wise, viagra high blood pressure the same sort of issues occur: with no doctype, viagra high blood pressure screen.height is a reliable 402; and with an HTML5 doctype, viagra high blood pressure the same value is also (eventually) returned. Viagra high blood pressure The XHTML-MP doctype, viagra high blood pressure or a constrained viewport, viagra high blood pressure will cause the eventual value to be 241, viagra high blood pressure but by way of various intriguing values. Viagra high blood pressure Our constrained, viagra high blood pressure HTML5 document, viagra high blood pressure for example, viagra high blood pressure reported 372 before and after the <body/>, viagra high blood pressure 223 on load, viagra high blood pressure and 241 at some point afterwards.

Viagra high blood pressure Yes, viagra high blood pressure these actual values are probably dependent upon the length of my particular test page itself, viagra high blood pressure but remember that these are supposed to be the physical screen dimensions, viagra high blood pressure folks!

Viagra high blood pressure Some semblance of normality returns to Android v2.3 in the PhoneGap environment. Viagra high blood pressure The values of 455 and 295 are hardly accurate measures of physical screen size, viagra high blood pressure either (since bizarrely they seem to take the 25 pixel status bar into account!), viagra high blood pressure but at least they’re close, viagra high blood pressure and hooray: take solace that the value does not change during the page lifecycle.

screen.availWidth & .availHeight

Viagra high blood pressure In the desktop world, viagra high blood pressure the available width and height returned by these two properties still relate to the whole screen, viagra high blood pressure rather than the browser’s window, viagra high blood pressure but they take operating system chrome into account. Viagra high blood pressure The menu bar in OSX means that screen.availHeight is at least 26 pixels less than screen.height, viagra high blood pressure for example – although the width values will probably be the same (unless you have a non-minimizing dock on the side of the screen).

Viagra high blood pressure In mobile, viagra high blood pressure one might expect the available values to take into account any OS status bar height. Viagra high blood pressure Let’s see, viagra high blood pressure shall we?

Viagra high blood pressure I need to caveat the Opera results here, viagra high blood pressure since the simulator runs in a dedicated window without any ‘real device’ chrome. Viagra high blood pressure But that should have implied that its available dimensions are the same as the screen’s – and this was not what was seen. Viagra high blood pressure In fact, viagra high blood pressure the availHeight is reduced to 369 from a height of 480, viagra high blood pressure not by any OS chrome, viagra high blood pressure but by the browser’s own rather fat chrome. Viagra high blood pressure This is not what is expected – even if, viagra high blood pressure on a real device, viagra high blood pressure it emerges that the OS chrome is deducted too.

Viagra high blood pressure And having labored over Android v2.3, viagra high blood pressure above, viagra high blood pressure there’s not much more to say here about that operating system either. Viagra high blood pressure Without exception it depressingly reports exactly the same values for availWidth and availHeight as it did for width and height – although at least that means that the PhoneGap values are now correct! Android v4.0’s browser also reports the same available values as it did for total width and height, viagra high blood pressure but fortunately they were slightly more sensible to begin with. Viagra high blood pressure But bizarrely the PhoneGap app doesn’t take the status bar height off as it does for v2.3.

Viagra high blood pressure And then there’s iOS: it does successfully deduct 20 pixels for the operating system’s chrome. Viagra high blood pressure But remember that orientation is ignored! So although a portrait availHeight is sensibly 460 (having dropped from 480), viagra high blood pressure it is anti-intuitively the width in a landscape orientation that is reduced (from 320 to 300) by a bar at the top of the screen!

Viagra high blood pressure Quirks on all fronts. Viagra high blood pressure Sigh.

window.outerWidth & .innerWidth

Viagra high blood pressure In contrast to the screen properties, viagra high blood pressure the window properties are understood to refer to the browser window itself. Viagra high blood pressure For desktop browsers, viagra high blood pressure (at least, viagra high blood pressure when they’re not running in full-screen mode), viagra high blood pressure the outer dimensions will normally be smaller than those for the screen. Viagra high blood pressure The inner dimensions then further deduct browser chrome: window borders, viagra high blood pressure toolbars, viagra high blood pressure status bars, viagra high blood pressure and so on, viagra high blood pressure and so they are normally smaller still.

Viagra high blood pressure In mobile, viagra high blood pressure we might expect the outer values to more or less match those for the available screen – since apps run full size. Viagra high blood pressure And indeed, viagra high blood pressure with window.outerWidth, viagra high blood pressure we have a good news story.

Viagra high blood pressure iOS v5.0 uses window.outerWidth to redeem itself over the lack of the orientation’s effect on screen. Viagra high blood pressure It is 320 for portrait viewing, viagra high blood pressure and 480 for landscape viewing. Viagra high blood pressure Bam.

Viagra high blood pressure Opera does the same. Viagra high blood pressure Bam. Viagra high blood pressure Astonishingly, viagra high blood pressure Android v2.3 also nails it. Viagra high blood pressure Bam.

Viagra high blood pressure In fact, viagra high blood pressure the only small blot that stops window.outerWidth being the model student is Android v4.0 in landscape: the property often has the portrait value of 320 before the <body> tag is reached. Viagra high blood pressure However, viagra high blood pressure this is arguably an edge case, viagra high blood pressure and a very minor misdemeanor.

Viagra high blood pressure After that rousing news, viagra high blood pressure it’s back to earth with a small bump for window.innerWidth. Viagra high blood pressure If your desktop experience had convinced you that innerWidth must be the same or smaller than outerWidth, viagra high blood pressure you’ve now got the TARDIS-like experience of mobile viewports to enjoy.

Viagra high blood pressure Without dropping into classic viewport theory here, viagra high blood pressure it’s sufficient to say that WebKit mobile browsers seem to use the boundary between the window’s ‘inner’ and ‘outer’ width and height properties to delineate the world of physical pixels and the world of viewport pixels: the latter a realm where zooming, viagra high blood pressure pinching and tapping allow the mobile browser to sensibly scale web pages designed for much larger screens.

Viagra high blood pressure For those pages where the viewport’s behavior is constrained, viagra high blood pressure perhaps through the use of meta tags, viagra high blood pressure this is of little concern, viagra high blood pressure since the mapping of the two worlds is 1:1. Viagra high blood pressure And indeed, viagra high blood pressure in our tests, viagra high blood pressure when such a tag is present, viagra high blood pressure innerWidth takes exactly the same value as outerWidth – modulo the Android race conditions, viagra high blood pressure at least.

Viagra high blood pressure Less well-known might be the fact that, viagra high blood pressure for all these browsers, viagra high blood pressure when an XHTML-MP doctype is present, viagra high blood pressure the same is also true. Viagra high blood pressure We’ve alluded to this already: the presence of this forces the viewport width to be the same as the physical width of the screen (either 320 or 480), viagra high blood pressure while still allowing subsequent scaling.

Viagra high blood pressure And of course, viagra high blood pressure PhoneGap’s default configuration is also to constrain the viewport, viagra high blood pressure so the values there also match.

Viagra high blood pressure But when the viewport has not been constrained, viagra high blood pressure and an HTML5 doctype (or none at all) is used, viagra high blood pressure innerWidth will suddenly start to represent values much larger than the physical screen: and represent the width of the viewport canvas upon which the page has been rendered.

Viagra high blood pressure On a portrait iPhone, viagra high blood pressure for example, viagra high blood pressure the default viewport is 980 pixels. Viagra high blood pressure On a landscape iPhone it is, viagra high blood pressure well, viagra high blood pressure according to window.innerWidth, viagra high blood pressure 981 (yes, viagra high blood pressure really).

Viagra high blood pressure Android 2.3 and earlier used a different value of 800 for the default viewport width, viagra high blood pressure and this is exposed as window.innerWidth (as well as the vestigal value before document load for the constrained tests). Viagra high blood pressure With Android 4.0, viagra high blood pressure the default viewport has been brought in line with the iPhone’s: 980 pixels.

window.outerHeight & .innerHeight

Viagra high blood pressure Mobile browsers normally have no vertical chrome, viagra high blood pressure so apart from the matter of viewports, viagra high blood pressure outerWidth and innerWidth values corresponded relatively nicely. Viagra high blood pressure However, viagra high blood pressure they do have horizontal chrome elements: address bars at top, viagra high blood pressure and toolbars at bottom. Viagra high blood pressure So we should expect the height to be reduced accordingly.

Viagra high blood pressure Opera, viagra high blood pressure in a way, viagra high blood pressure gets this right. Viagra high blood pressure We have already pointed out it surprisingly deducted the browser chrome to calculate its screen.availHeight. Viagra high blood pressure But since it then promptly uses the same value for window.outerHeight and window.innerHeight, viagra high blood pressure it meets our expectations on the latter of these two properties at least.

Viagra high blood pressure For Android, viagra high blood pressure window.outerHeight is also relatively deterministic. Viagra high blood pressure Again, viagra high blood pressure there are timing wobbles, viagra high blood pressure but after page load, viagra high blood pressure the values are consistently 455 (in portrait) and 295 (in landscape). Viagra high blood pressure The Android OS bar, viagra high blood pressure as we’ve mentioned, viagra high blood pressure is 25 pixels.

Viagra high blood pressure But it’s iOS that baffles this time. Viagra high blood pressure Only in homescreen mode, viagra high blood pressure with an HTML5 doctype (or none at all), viagra high blood pressure does the browser report the expected window.outerHeight value of 460.

Viagra high blood pressure In all other cases, viagra high blood pressure bizarre numbers come out. Viagra high blood pressure For iOS v5.0, viagra high blood pressure for constrained portrait pages, viagra high blood pressure it’s 356 that becomes 445. Viagra high blood pressure For non-constrained portrait pages it’s 356 that becomes 1602. Viagra high blood pressure For constrained landscape pages it’s 208 that becomes 667. Viagra high blood pressure For non-constrained portrait pages it’s 208 that becomes 1702. Viagra high blood pressure In PhoneGap, viagra high blood pressure it’s 460 that becomes 1602, viagra high blood pressure or 480 that becomes 1202. Viagra high blood pressure And for constrained homescreen apps, viagra high blood pressure it’s 480 that becomes 1602.

Viagra high blood pressure The fact that this is the one property whose values significantly vary from iOS v4.3 to iOS v5.0 also raises alarm bells.

Viagra high blood pressure Perhaps we could write a whole blog post to reverse engineer is going on here. Viagra high blood pressure 356 and 208 seem to have some plausibility, viagra high blood pressure but apart from that – who knows? There’s no apparent Safari documentation for this property, viagra high blood pressure and even WebCore’s own test suite describes the expected results as ‘empirical‘.

Viagra high blood pressure I think I can safely caution you never to use window.outerHeight in iOS and expect a meaningful answer.

Viagra high blood pressure After that, viagra high blood pressure window.innerHeight seems relatively stable and predictable. Viagra high blood pressure In constrained (and XHTML-MP) scenarios in the regular iOS browser, viagra high blood pressure it sits at that familiar 356 value for portrait and 208 for landscape. Viagra high blood pressure This is the actual inner height of the browser window, viagra high blood pressure sans browser chrome, viagra high blood pressure as per documentation. Viagra high blood pressure (The fact that these two values are not the same amount less than the physical screen dimensions is due to the fact that the landscape toolbar is slightly shallower than the portrait one.)

Viagra high blood pressure This pattern is also consistent when the page is launched constrained from the homescreen or in a PhoneGap application. Viagra high blood pressure Here, viagra high blood pressure without any browser chrome at all, viagra high blood pressure the values correctly return to the physical screen dimensions minus the 20 pixel tool bar.

Viagra high blood pressure However, viagra high blood pressure this value is not as trustworthy when the page has a non-constrained viewport and an HTML5 (or omitted) doctype. Viagra high blood pressure In our test, viagra high blood pressure window.innerHeight had values of 1091 and 425 for the two orientations – doubtless dependent upon the length of the content in our actual page – and hard to predict. Viagra high blood pressure As if to prove that point, viagra high blood pressure in homescreen mode, viagra high blood pressure this value increases to 1409. Viagra high blood pressure Not particularly useful.

Viagra high blood pressure When we look at window.innerHeight for Android, viagra high blood pressure the results appear to follow a similar pattern, viagra high blood pressure but, viagra high blood pressure as usual, viagra high blood pressure are somewhat obfuscated by the fact they change throughout the page lifecycle. Viagra high blood pressure For constrained viewports, viagra high blood pressure the two orientations’ values are 401 and 241 in Android v2.3 (where the address bar is 54 pixels high), viagra high blood pressure and 403 and 243 in Android v4.0 (where the address bar is 52 pixels high), viagra high blood pressure and the PhoneGap values are also as expected, viagra high blood pressure considering there is no address bar.

Viagra high blood pressure But again, viagra high blood pressure the determinism disappears when the viewport is not constrained, viagra high blood pressure the reported values as varied 1234, viagra high blood pressure 496, viagra high blood pressure 1003 and 402. Viagra high blood pressure We can deduce that these are viewport lengths rather than window size, viagra high blood pressure that they are content-dependent, viagra high blood pressure and that they change between platform versions due to the updated viewport width – but again, viagra high blood pressure their utility is more doubtful than in the constrained scenarios.

body.offsetWidth, viagra high blood pressure .clientWidth, viagra high blood pressure .offsetHeight, viagra high blood pressure & .clientHeight

Viagra high blood pressure We move onto our final set of JavaScript APIs, viagra high blood pressure and we might hope that we are leaving the vagaries of BOM implementations and entering the consistency of the DOM & CSSOM (although, viagra high blood pressure sadly, viagra high blood pressure these properties are still not under the purview of any W3C standard).

Viagra high blood pressure These four values should theoretically be available on all DOM elements: the ‘offset’ dimensions include an element’s content, viagra high blood pressure padding and border, viagra high blood pressure while the ‘client’ dimensions are the content and padding alone. Viagra high blood pressure Neither include the margin, viagra high blood pressure as detailed in Mozilla’s documentation.

Viagra high blood pressure In our case, viagra high blood pressure we are querying these properties for the document’s body, viagra high blood pressure and, viagra high blood pressure since it has no border, viagra high blood pressure the offset and client values should be the same. Viagra high blood pressure Our test pages add a CSS margin of 10 pixels, viagra high blood pressure so on the desktop, viagra high blood pressure we would expect its width, viagra high blood pressure at least, viagra high blood pressure to be 20 pixels less than window.innerWidth. Viagra high blood pressure Empirically, viagra high blood pressure desktop browsers seem to use the two heights to represent the total length of the page, viagra high blood pressure rather than the height of the window display. Viagra high blood pressure (I’d thought that would be body.scrollHeight, viagra high blood pressure but that’s another story.)

Viagra high blood pressure How do mobile browsers fare? How does the viewport concept affect these values?

Viagra high blood pressure With offsetWidth and clientWidth, viagra high blood pressure iOS and Android work broadly as you would expect. Viagra high blood pressure The non-constrained viewports return measurements in the high 900s (and around 800s for Android v2.3), viagra high blood pressure and the constrained pages in the low 300s (for portrait) and mid 400s (for landscape).

Viagra high blood pressure It’s notable how and when the choice of doctype affects these values though. Viagra high blood pressure With an HTML5 doctype, viagra high blood pressure non-constrained viewport tests on both platforms report 20 pixels less than the viewport size for both values: 960 pixels regardless of orientation.

Viagra high blood pressure With an XHTML-MP doctype, viagra high blood pressure as we’ve previously mentioned, viagra high blood pressure the viewport becomes the device width by default, viagra high blood pressure and again 20 pixels are correctly deducted to give us values of 300 and 460 in landscape and portrait respectively. Viagra high blood pressure The same expected behaviour is seen with HTML5 doctypes used on constrained viewports.

Viagra high blood pressure What is slightly strange is when no doctype is used. Viagra high blood pressure In this case, viagra high blood pressure again on both platforms in all scenarios, viagra high blood pressure the clientWidth is the full viewport width (980, viagra high blood pressure 800, viagra high blood pressure 480 or 320), viagra high blood pressure and the offsetWidth is reduced by the margin (to 460, viagra high blood pressure 780, viagra high blood pressure 460, viagra high blood pressure or 300). Viagra high blood pressure This seems systemic: as though the lack of doctype puts the browser into a mode where it interprets the body’s margin as a border.

Viagra high blood pressure Across all of our testing combinations, viagra high blood pressure though, viagra high blood pressure the offsetHeight and clientHeight values are the most bizarre set of results in the whole experiment.

Viagra high blood pressure There are three patterns on Android and iOS. Viagra high blood pressure Firstly, viagra high blood pressure pages with no doctype will always have clientHeight equal to window.innerHeight once the </body> tag has closed – but the offsetHeight will be completely different. Viagra high blood pressure Secondly, viagra high blood pressure when there is a doctype, viagra high blood pressure the clientHeight and offsetHeight are always the same, viagra high blood pressure and nearly always regardless of what the doctype actually is. Viagra high blood pressure (The bizarre exception is Android v2.3 where the HTML5 doctype on the non-constrained viewport causes both values to reduce dramatically at some point after the document load event). Viagra high blood pressure And finally, viagra high blood pressure the offsetHeight value of the non-doctype test always produces the same values as the clientHeight and offsetHeight of the HTML5 equivalent.

Viagra high blood pressure Got that?

Viagra high blood pressure But what the values actually are seems extremely non-deterministic. Viagra high blood pressure We’ve already commented on the arbitrary nature of window.innerHeight which the non-doctype results seem to echo. Viagra high blood pressure But despite the doctype, viagra high blood pressure orientation and viewport size, viagra high blood pressure the meaning of these values would seem very hard to assess. Viagra high blood pressure The best we can say is that when clientWidth or offsetWidth go up, viagra high blood pressure clientHeight or offsetHeight go down (as seems sensible), viagra high blood pressure but that no attention seems to be paid to our 20 pixel margin.

Viagra high blood pressure Again, viagra high blood pressure properties best left alone, viagra high blood pressure I think.

Viagra high blood pressure In contrast to iOS and Android, viagra high blood pressure which use window outer and inner dimensions as the point of delineation between physical pixels and the viewport, viagra high blood pressure Opera Mobile’s strategy seems to have been to to stay in the world of real pixels until this last document.body set of measurements, viagra high blood pressure and finally we get a sense of how it sizes the viewport.

Viagra high blood pressure The default viewport width seems to be 850 pixels, viagra high blood pressure but although Opera has, viagra high blood pressure until now, viagra high blood pressure remained oblivious to the pages’ doctypes, viagra high blood pressure the values seem to suddenly be very dependent upon them. Viagra high blood pressure With an HTML5 doctype on a non-constrained viewport, viagra high blood pressure both clientWidth and offsetWidth are 830 (which probably has had the 20 pixel margin deducted), viagra high blood pressure and with XHTMLMP, viagra high blood pressure we get 300 or 460 (which would be consistent with a constrained viewport, viagra high blood pressure also minus margins).

Viagra high blood pressure But with no doctype and no viewport constraint, viagra high blood pressure in either portrait or landscape, viagra high blood pressure we get 850 for clientWidth (i.e. Viagra high blood pressure no padding) and… for offsetWidth, viagra high blood pressure 2048! What?

Viagra high blood pressure And finally, viagra high blood pressure as they were for iOS and Android, viagra high blood pressure the clientHeight and offsetHeight are a fairly disparate bunch of values. Viagra high blood pressure The only assumptions we can make are that a) constrained clientHeight with no doctype will be the same as window.innerHeight after the </body> tag; that b) clientHeight and offsetHeight for constrained HTML and any type of XHTML-MP will all be the same value for a given orientation (and that non-constrained HTML5 will also eventually converge on that value sometime after the document load event); and c) that the values themselves will be more or less unpredictable.

Viagra high blood pressure But perhaps not as meaningless as the offsetHeight for non-constrained doctype-less pages. Viagra high blood pressure It’s consistent. Viagra high blood pressure But a highly unlikely 40960 – which must surely, viagra high blood pressure more or less, viagra high blood pressure mean undefined!

@media device-width & width, viagra high blood pressure device-height & height

Viagra high blood pressure We conclude the menagerie of screen dimensions by looking at the values used in CSS3 media queries. Viagra high blood pressure These are used as ‘features’ in declarations which are used to conditionally load stylesheets or apply the rules within them. Viagra high blood pressure Media queries are a staple of contemporary web design, viagra high blood pressure and perhaps should be understood by designers as much as the other properties above need to be understood by developers handling layouts.

Viagra high blood pressure Finally, viagra high blood pressure we have some properties which are defined by a standard.

Viagra high blood pressure Because, viagra high blood pressure for this test, viagra high blood pressure we needed to evaluate these values in JavaScript, viagra high blood pressure we use the matchMedia function and varied the operand until it returned true. Viagra high blood pressure This does mean we only have results for those devices which support that API call: namely iOS v5.0 and Android v4.0.

Viagra high blood pressure Well it’s nice to end with some good news. Viagra high blood pressure In both platforms, viagra high blood pressure in all conditions, viagra high blood pressure @media device-width always returns the same value as screen.width, viagra high blood pressure and device-height always returns the same value as screen.height. Viagra high blood pressure There’s no matchMedia support in Opera, viagra high blood pressure but I’ll assume the same would be true.

Viagra high blood pressure This is great – but of course don’t forget the main issue afflicting those measurements: the lack of rotated values in iOS and Android 2.3’s wacky 800 viewport value which I’ll postulate may be echoed here too.

Viagra high blood pressure @media width and height also track other JavaScript properties in both platforms. Viagra high blood pressure @media width is almost always equal to window.innerWidth (except in non-constrained landscape mode in iOS v5 when the former is 980 and the former that curious 981). Viagra high blood pressure @media height is always equal to window.innerHeight.

Viagra high blood pressure (It’s not so clear whether this pattern would be followed by Opera too, viagra high blood pressure were we able to measure it this way. Viagra high blood pressure To confirm, viagra high blood pressure it would require a CSS-based test harness – perhaps another study.)

Viagra high blood pressure But there are a couple of things worth saying about this observation. Viagra high blood pressure Firstly, viagra high blood pressure the window.innerWidth and window.innerHeight values themselves are something of a bit of a mixed bag. Viagra high blood pressure See the earlier discussions above.

Viagra high blood pressure Secondly, viagra high blood pressure it’s interesting to note that the matchMedia result changes with page lifecycle in the same way that the regular JavaScript measures do. Viagra high blood pressure This may mean that media queries change their results as the page loads – I don’t know how to predict when these parametric CSS rules are evaluated – and I imagine this might create conditions under which certain resources referred to in the CSS, viagra high blood pressure loaded early in the page (when the size is evaluated to one thing), viagra high blood pressure might turn out to have been unneccessary later in the page’s life (when the size is evaluated to quite another thing).

Viagra high blood pressure Hardcore browser theory & probably more testing required.

window.orientation & @media orientation

Viagra high blood pressure As a final aside, viagra high blood pressure note that we also measured orientation results. Viagra high blood pressure window.orientation returns the number of degrees (0 for portait, viagra high blood pressure 90 for landscape), viagra high blood pressure and is flawless in iOS, viagra high blood pressure and set correctly after </body> on Android. Viagra high blood pressure (Just remember not to evaluate orientation before the <body> – it’s likely still to be 0 in landscape mode)

Viagra high blood pressure Opera does not seem to support the API.

Viagra high blood pressure The media query equivalent is also apparently fine (where measurable). Viagra high blood pressure The only Android timing quirk here is PhoneGap in portrait which thinks it’s landscape at first. Viagra high blood pressure I guess nothing’s perfect.

Summary

Viagra high blood pressure Wow. Viagra high blood pressure Painful, viagra high blood pressure on the whole.

Viagra high blood pressure Let’s see what we can briefly conclude. Viagra high blood pressure I’m not going to go back through each of the properties, viagra high blood pressure but a couple of things jumped out at me.

  • Doctypes matter – you may have no intention of using an XHTML-MP doctype, viagra high blood pressure but if you forget your HTML5 one, viagra high blood pressure some measurements are affected.
  • Default viewports vary from 980 through 850, viagra high blood pressure to 800, viagra high blood pressure depending on platform. Viagra high blood pressure Be aware that Android’s default has changed between v2.3 and v4.0.
  • Page lifecycle matters: even if you aren’t stupid enough to run measurement code before the <body>, viagra high blood pressure it can still change radically afterwards, viagra high blood pressure at the document load event, viagra high blood pressure or – most painfully – sometime after that.
  • Race conditions seem more common on Android than on iOS – I admit this could also be affected by the poor performance of the platform’s emulator
  • Height measurements are probably too nerve-wracking to use – as might be expected. Viagra high blood pressure Except in iOS, viagra high blood pressure where you’ll need height to get width.
  • Nothing much is standardized and where viewports are involved, viagra high blood pressure the chaos of interpretation ensues. Viagra high blood pressure That matchMedia provides a JavaScript API into the (standardized) CSS3 properties might be a chink of light.

Viagra high blood pressure But overall, viagra high blood pressure the message should be: don’t take anything for granted. Viagra high blood pressure Mobile diversity is, viagra high blood pressure unsurprisingly, viagra high blood pressure still with us with a vengeance – even for apparently simple things like screen size.

Viagra high blood pressure Check out the table again, viagra high blood pressure get a little scared, viagra high blood pressure choose your APIs carefully, viagra high blood pressure and test on real devices* like crazy.

Viagra high blood pressure (* yes, viagra high blood pressure yes, viagra high blood pressure I still realize this whole experiment is underpinned by the ultimate sin of using emulators 🙂 )

Viagra high blood pressure Thoughts? War stories? Techniques? Fears? Comments welcome.

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