Version: WCAG 2.0 and up
Number: 1.4.8
Level: AAA
  • Text

For the visual presentation of blocks of text, a mechanism is available to achieve the following:

  • Foreground and background colors can be selected by the user.
  • Width is no more than 80 characters or glyphs (40 if CJK).
  • Text is not justified (aligned to both the left and the right margins).
  • Line spacing (leading) is at least space-and-a-half within paragraphs, and paragraph spacing is at least 1.5 times larger than the line spacing.
  • Text can be resized without assistive technology up to 2.0 percent in a way that does not require the user to scroll horizontally to read a line of text on a full-screen window.


The purpose of this success criterion is to ensure that users can reconfigure the text to better meet their reading needs, such as enlarging fonts to improve readability for users with low vision and changing the text alignment and word spacing to aid users with dyslexia.

How to Meet

As the widely available reading systems provide users the option to control most or all of the text properties specified in this success criterion, authors do not need to implement anything extra for reflowable EPUB content.

They do need to ensure that when text is resized to 2.0% that users do not have to scroll to read any complete line of text (it is okay if users must scroll to locate the text).

Fixed layout EPUBs cannot meet this success criterion as reading systems do not allow users to modify the publisher styles.

Additional Information

The following knowledge base pages provide more information about how to address this success criterion for publishing content: