Bugzilla

FWIW it looks like we could at least avoid the scrollbar-related failures here (which is most of them) by adding...
```
:root { overflow:hidden}
```
...on the testcase and reference case here.

Here's a try run with that, where almost all of the oranges are a failure in another test (bug 1908583), and the only failure in this test is a case where we're completely blank (which is one of the failure modes here per end of comment 11, though it's a less common one.)

I'm tempted to add that as a short-term band-aid to reduce the volume here.

FWIW it looks like we could at least avoid the scrollbar-related failures here (which is most of them) by adding...
```
:root { overflow:hidden}
```
...on the testcase and reference case here.

Here's a [try run with that change](https://treeherder.mozilla.org/jobs?repo=try&revision=8ab80c686c5334dcc099749be113942e8cb0d6c3), where almost all of the oranges are a failure in another test (bug 1908583), and the only failure in this test is a case where we're completely blank (which is one of the failure modes here per end of comment 11, though it's a less common one.)

I'm tempted to add that as a short-term band-aid to reduce the volume here.