Test for WCAG success criterion 1.4.4: Resize text

[hannolans]

http://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-scale.html
Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality. (Level AA)

Applicable

Always

Failures

• F69 ( Test for WCAG failure F69: Resizing visually rendered text up to 200 percent causes the text, image or controls to be clipped, truncated or obscured #222): Resizing visually rendered text up to 200 percent causes the text, image or controls to be clipped, truncated or obscured
• F80: Text-based form controls do not resize when visually rendered text is resized up to 200%

Techniques

• G142 (Test for WCAG technique G142: Using a technology that has commonly-available user agents that support zoom #221): Using a technology that has commonly-available user agents that support zoom
• C12: Using percent for font sizes
• C13: Using named font sizes
• C14: Using em units for font sizes
• SCR34: Calculating size and position in a way that scales with text size (Scripting)
• G146: Using liquid layout
• G178: Providing controls on the Web page that allow users to incrementally change the size of all text on the page up to 200 percent
• G179: Ensuring that there is no loss of content or functionality when the text resizes and text containers do not change their width

Relationship

• G142 will always pass, so no further technique checks needed for minimal testing
• F69 is under discussion, implement as soon aswe have more clarity
• F80 is only applicable for forms