Use shadow dom to render the toolbar #2266
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Description
Following the discussion on #2007, I started experimenting with shadow DOM and it turns out it's pretty easy to make it work with the debug toolbar.
Most of the changes are related to getting the correct root for querying elements in JS, and those could be extracted to a separate pull request to make it easy to review the changes specific to shadow DOM.
The only change required for custom panels is that they should access the root debug element via the
getDebugElementfunction inutils.jsinstead of directly querying#djDebug, and they should perform all element queries from that root.This change effectively isolates the Debug Toolbar styles from the rest of the page, which would make it easier to implement all sorts of utility classes for more advanced panel styling.
Checklist:
docs/changes.rst.