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WCAG/1-perceivable/1.4.4-resize-text.md
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1.4.4 Resize Text

  • Level: AA
  • Guideline: 1.4 Distinguishable
  • Principle: 1 Perceivable

What it is

Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality.

How to test

  • Check: Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality.
  • Use the sufficient techniques below as acceptable methods when applicable.
  • Confirm none of the common failures apply.

Sufficient techniques (W3C)

  • G142: Using a technology that has commonly-available user agents that support zoom
  • Ensuring that text containers resize when the text resizes
  • using measurements that are relative to other measurements in the content
  • C28: Specifying the size of text containers using em units
  • 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
  • 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

Advisory techniques (W3C)

  • C17: Scaling form elements which contain text
  • C20: Using relative measurements to set column widths so that lines can average 80 characters or less when the browser is resized
  • C22: Using CSS to control visual presentation of text

Common failures (W3C)

  • F69: Failure of Success Criterion 1.4.4 when resizing visually rendered text up to 200 percent causes the text, image or controls to be clipped, truncated or obscured
  • F80: Failure of Success Criterion 1.4.4 when text-based form controls do not resize when visually rendered text is resized up to 200%
  • F94: Failure of Success Criterion 1.4.4 due to incorrect use of viewport units to resize text

Resources

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