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Resize Text
Guideline
Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality.
Intent
The intent of this regulation is to ensure that visually rendered text, including text-based controls (text characters that have been displayed so that they can be seen [vs. text characters that are still in data form such as ASCII]) can be scaled successfully so that it can be read directly by people with mild visual disabilities, without requiring the use of assistive technology such as a screen magnifier. Users may benefit from scaling all content on the Web page, but text is most critical.
The scaling of content is primarily a user agent responsibility. User agents that satisfy UAAG 1.0 Checkpoint 4.1 allow users to configure text scale. The author's responsibility is to create Web content that does not prevent the user agent from scaling the content effectively. Authors may satisfy this requirement by verifying that content does not interfere with user agent support for resizing text, including text-based controls, or by providing direct support for resizing text or changing the layout. An example of direct support might be via server-side script that can be used to assign different style sheets.
Finding Applicable Components
Set the browser font size to 200%.
Utilizing the browser zoom feature may not give adequate results. For instance, using the browser zoom feature may increase font size but increasing the browser font size may not.
Inspecting and Using Components
- Set the browser font size to 200%.
- Verify that the font was sized correctly and did not retain its original size.
- Verify that text, images, or controls are not clipped, truncated, or obscured.
Section 508/WCAG 2.0 Failure Conditions
- Font does not properly resize after setting the browser font size.
- Fails 1194.21(b) Built-in Accessibility Features.
- Fails 1.4.4 Resize text.
- Text, images, or controls are clipped, truncated, or obscured.
- Fails 1194.21(b) Built-in Accessibility Features.
- Fails 1.4.4 Resize text.
Reporting Test Results
Any failure in Section 508 Failure Conditions results in: Fails Baseline Requirement #28.
Page text resizes in relation to the browser set font size and does not result in text, images, or controls becoming clipped, truncated, or obscured then: Passes Baseline Requirement #28.
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