True or False: 1.4.10 Reflow - Mobile and 320px testing

[A11yTea]

Hi everyone, I am requesting a clear answer to the following questions:

• Is mobile testing required for 1.4.10 Reflow? Or is mobile testing possible only if 320 CSS pixels (for vertical scrolling content) can be achieved with the phone? Like, let's say I have a phone with 430 CSS pixels of width. I assume that testing with that phone at 430 CSS pixels is not a legitimate test for this criteria.
• If content fails at 321 CSS pixels of width but passes at exactly 320 CSS pixels of width, then can I assume that it passes for Reflow? So Reflow does not care about any other widths but 320 CSS pixels (assuming vertical scrolling content), is that right?

[patrickhlauke]

Is mobile testing required for 1.4.10 Reflow

1,4,10 requires that you test at the specified viewport width or height. whether you do it on a phone, tablet, desktop browser, or something else is up to you.

If content fails at 321 CSS pixels of width but passes at exactly 320 CSS pixels of width, then can I assume that it passes for Reflow?

as written, the SC only applies for those exact widths/heights. nothing more.