sync scrolling if there's a 2-column layout

[deniak]

The PR enable the scrolling of the 2 columns together if reduce motion is enabled.
See example: https://cdn.statically.io/gh/w3c/tr-design/2-column-scroll/src/README.html
Fix #287

[dontcallmedom]

I now understand why you thought scrolling needed to be proportional to the height, but what I had in mind is different from what this PR produces: this PR keeps 2 different scrolling contexts (one for the TOC, one for the content), and when the TOC has been fully scrolled, it is then stuck.

My suggestion was to make the TOC part of the same scrolling context as the content, which means that it would simply start disappear once it reaches the bottom.

[deniak]

My suggestion was to make the TOC part of the same scrolling context as the content, which means that it would simply start disappear once it reaches the bottom.

Of course, that makes more sense. I updated the PR so simply include the MQ rules.

[dontcallmedom]

I've verified locally that the updated result matches what I had in mind and I think addresses #287 , but I don't think the statically URL reflects the latest version unfortunately - anyway to trigger its update?

[deniak]

AFAIK, statically doesn't provide a way to invalidate the cache so we have to wait to it to be invalidated automatically (after 1 day) or use a different service.

[MarjaE2]

For me, it starts off good, but then the left column runs out and the headaches start again.