![]() Since the Understanding page seems more specifically focussed on the zoomers, I believe it to be a failure of Reflow if a page becomes unusable with zoom even if seems okay on a 320px-width mobile device, or mobile device emulator.When content in your site or application is zoomed up to 400%, does text wrap into one column so scrolling is not required in more than one direction? (Another example might be that, with a zoomed view, I can see that for example on Wikipedia, when hovering over a inter-wiki-link shows a popup for that page, it's often offscreen at my useful-zoom-level, while on mobiles either hovering's not a thing, or I can't figure it out on the browser tool.) Or in the case of something I'm testing right now, an entire chunk of content vanishes completely due to the page being made up of a sticky header and a sticky footer). Being able to set a desktop browser to 1280 reliably and zooming in 400% is easier to see, easier to test, and easier to note problems with stickies (on a tall 320 "portrait" phone, a sticky area may only take up a small portion of the screen, while on my zoomed desktop it's, like, half. I check both, but honestly it's also hard for me to see the 320 view (in this device emulator tool is talking about) esp after shortening the "height" value (which testers should be doing) since on zoomed desktops you've generally got a "landscape", not "portrait" view. This was already discussed in issue #987 but it seems there was no resolution for this I'm referring to the note in the SC. Unless that amount of content (measured in body text lines or some other metric) is defined, there seems currently no normatively backed way of failing content if at least one line (of content? headings?) is fully visible. on a common laptop with a 16:9 display ratio where zooming in to 400% usually with browser maxed means that you have only have around 145px clientHeight (if you subtract what is needed for tab bar, menu bar and the like), meaning that even with modestly sized fixed content at top or bottom, there is hardly any space left for scrolling page content. ![]() I guess the question is still open how to handle the lack of usable space at zoomed in sizes, e.g. The Firefox option "Responsive Design Mode" of the web developer tools provides a more accurate rendition of what the screen looks like when zoomed in on the desktop (check out in both renditions) so this currently seems the way to go if you do not want to use Chrome, set width to 1280px, and zoom in to 400% (where you then often have to deal with the question whether fixed content would fail 1.4.10, and at what viewport height.). 320px for iPhone5/SE) does not produce the same layout as 400% Zoom from 1280px on the desktop. The DevTools function in Chrome to view the page at different device sizes (e.g. So the option of setting the viewport width with Firefox > Web Developer Toolbar > Resize to 320px (or 336px when accounting for the scrollbar) fails to show the page at the desired viewport width because the browser does not support such narrow widths. ![]() ![]() With Edge, you can get down to a clientWidth of 355. The common desktop browsers do not support narrowing the viewport width to 320px: Firefox stops at a clientWidth (viewport width minus scrollbar width) of 435px and Chrome at 483.
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