HTMLMediaElement http-equiv should only not be processed in shadow trees:
Firefox and Chrome already match the specification here.
Created attachment 435298 [details]
Created attachment 435306 [details]
Created attachment 435348 [details]
Comment on attachment 435348 [details]
Committed r280913 (240434@main): <https://commits.webkit.org/240434@main>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 435348 [details].