Display properties are controllable by the user.


Example 1 — EPUB 3
<meta property="schema:accessibilityFeature">
Example 2 — EPUB 2
<meta name="schema:accessibilityFeature"
Example 3 — Audiobooks
"accessibilityFeature": ["displayTransformability"]


The displayTransformability value is used to indicate that a publication does not restrict the ability of users to modify the display of textual content (e.g., to change the font family, font size, line height and word spacing).

In order to set this value, all text content must be encoded as text (i.e., there must not be any images of text). In addition, absolute length units must not be used in the styling (e.g., pixels and points).

It is not required that a publication provide the means of transforming the text. It is expected that users who require this feature will have a reading system that with display transform options.

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