Change record status: 
Introduced in branch: 
7.x-1.x
Introduced in version: 
7.x-1.3
Description: 

Two dimensions (width and height) are added into every context and take empty value by default. Transcoders and players should use these values when possible to render atom in the expected dimensions.

Not to be confused with native atom dimensions (e.g. width, height or duration of a video).

Impacts: 
Site builders, administrators, editors
Module developers