What is the required page width for testing “Resize Text”?
Currently, there is no specific page width identified within the WCAG for Success Criteria 1.4.4: Resize Text. However, we do believe that there should be one and hope there will be one eventually, since there are instances where content on pages is lost at 200% zoom at some widths and not others.
For consistency’s sake and because it is not possible to test at every possible page width, we start the test at a browser window width of 1280 CSS pixels and then zoom to 200%. We use 1280 CSS pixels as our standard width because this width is specifically required by the WCAG for testing a page for Success Criteria 1.4.10: Reflow failures. For reflow failures, a tester starts at a 1280 CSS pixels browser width before zooming into 400%.
For additional help, the Guided Manual WCAG Audit Tool from Accessible Web includes a step to help automatically adjust your browser width for these types of manual tests.
There is not a required page width when zooming into 200% to test for Success Criteria 1.4.4: Resize Text. At Accessible Web, we test by starting at a browser window width of 1280 CSS pixels and zoom to 200% from there. This is to ensure consistency and because it is not possible to test at all widths. We hope that WCAG will define a required page width in the future.
Free Tools to Continue Learning
Accessible Web RAMP
Monitor your website and manage your progress towards WCAG conformance.
Accessible Web Academy
Career specific courses to help power up your accessibility knowledge.