- Never use open shadow root for highlight. This messes up
our selectors that accidentally match internal preview elements.
- Remove failing electron test that we do not care about.
- Skip `channels.spec.ts` in non-default mode.
`npx playwright open --save-har=file.har` produces a HAR file that
can be later inspected or used for mocks.
`--save-har-glob="**/*.{png,woff2}"` option can be used to
produce a smaller har that only contains entries matching the glob.
