Top html issues

Media: add method to discover whether playback is allowed before calling `play()`

additioproposal media

Allow auto-resize on iframe

additioproposal needs implementer interest

Utilizing Aspect-Ratio with Art Direction (Multiple Sources with various Aspect Ratios known)

additioproposal needs implementer interest img rendering

<img>: Have an autorotate="" attribute that honours orientation metadata in the image (e.g. EXIF)

additioproposal impacts documentation img

Proposal: a non-render-blocking way to load stylesheets

additioproposal style

Allow webauthors to customize what controls are shown for HTMLMediaElement

additioproposal needs implementer interest media

HTML should support self-closing tags in general

additioproposal needs implementer interest

When is a lazy-loaded image "about to intersect the viewport"

img

ElementInternals should work with customized built-in elements

additioproposal custom elements

Make underscore-prefixed attributes formally valid (works AS IS in all existing browsers)

additioproposal document conformance