Part of Item:
Comment Type: TE
Comment (including rationale for proposed change):
Guideline 1.4 is concerned with making it easy to distinguish foreground information from the background. Many people with impaired vision, including a significant proportion of the older population, often find it hard to read the default text size. The use of absolute values for font sizes can make it very difficult for people with impaired vision to increase the size of the text on the screen. Sometime these people have the knowledge and opportunity to change the default computer settings but this is often not the case.
I suggest Guideline 1.4 should contain a new level 2 Success Criteria that requires the use of relative rather than absolute values to control the size of all text including headings.
Although resizing is primarily a user agent function, we have added new success criteria to address the author's responsibility for supporting text resizing:
Level AA: Visually rendered text can be resized without assistive technology up to 200 percent and down to 50 percent without loss of content or functionality.
Level AAA: Visually rendered text can be resized without assistive technology up to 200 percent and down to 50 percent without loss of content or functionality and in a way that does not require the user to scroll horizontally.