HTML Modules

[tobireif]

Some links:

https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/ewfRSdqcOd8/w_Fr6rJ3DQAJ

WICG/webcomponents#645

[tclzcja]

Chrome platform status and Chromium bug tracker just got updated:

https://chromestatus.com/feature/4854408103854080

https://bugs.chromium.org/p/chromium/issues/detail?id=990978