Andrea Fercia b2ae00cd21 Accessibility: Ensure embed iframes have a title attribute. ...

Screen reader users rely on the iframe title attribute to describe the contents of iframes. A meaningful title attribute allows to quickly identify the iframe content, so users can determine which iframe to enter and explore in detail or skip if desired.
Note: this is the only case where a title attribute is required for compliance with the W3C Web Content Accessibility Guidelines (WCAG).

- checks for oEmbed response of type `video` or `rich`
- checks if they use an iframe
- fetches the title (if any) from the oEmbed response
- adds the title to the embed iframe

Props bamadesigner, TomHarrigan, swissspidy, jrf, afercia.
Fixes #40245.

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git-svn-id: http://core.svn.wordpress.org/trunk@44773 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2019-03-20 17:22:51 +00:00

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