4 tests in css-variables seem to be consistent timeout, but actually pass in Edge

[foolip]

https://wpt.fyi/css/css-variables/variable-transitions-from-no-value.html https://wpt.fyi/css/css-variables/variable-transitions-to-no-value.html https://wpt.fyi/css/css-variables/variable-transitions-transition-property-variable-before-value.html https://github.com/w3c/web-platform-tests/blob/master/css/css-variables/variable-transitions-value-before-transition-property-variable.html

At least of these pass when running manually in Edge. This is similar to https://github.com/w3c/wptdashboard/issues/239 and probably both are due to the same underlying cause, but fixing this in particular is important because it looks like the test itself is wrong due to this.

@gregwhitworth FYI.

[foolip]

Calling it roadmap because the underlying bug probably needs to be fixed to succeed with Consistent results for all browsers are updated every 24 hours.