Change record status: 
Project: 
Introduced in branch: 
9.3.x
Introduced in version: 
9.3.0
Description: 

Previously the oEmbed system requires all non-link resources (i.e., photos, videos, rich text) to have an explicit, non-zero width and a height defined inline with the oEmbed specification.

However, some oEmbed providers, like Twitter and Instagram, disobey this rule because the assets they serve contain live text, and may be responsive, so they can't really have a known, predefined height.

In order to ensure Drupal can accommodate those providers, from 9.3.0 the height of a non-link resource is now optional and if not provided will fallback to the maximum height set in the formatter.

Impacts: 
Site builders, administrators, editors