USWDS - Header: Remove FOUC on extended header with mega-menu. #4057
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Description
Closes #4047. Adds a more specific selector to extended header with mega-menu to remove the flash of unstyled content.
Additional information
Steps to test:
Network → No Throttling ↕ → Regular 2G
In Chrome
Network → Online ▼ → Slow 3G
Before you hit Submit, make sure you’ve done whichever of these applies to you:
npm test
and make sure the tests for the files you have changed have passed.