Once the backdrop-filter property CSS parsing is implemented, the DevTools should show a tooltip for editing filters similar to the filter property tooltip.
For reference, it looks like the "filter" tooltip/widget is implemented in these two JS files (at least):
It looks like all we may need to do is add an additional check for backdrop-filter here:
Yes, we would only need to make some changes in the output-parser.js regarding whether or not it should expectFilter.
I have originally set this to P3 due to the fact it has blockers. However, we can add a check for whether or not backdrop-filter is enabled in platform and if so check if the name matches backdrop-filter.
Pushed by firstname.lastname@example.org:
Enable filter tooltip for backdrop-filter in devtools r=gl