fix(v2): do not set height for mobile dropdown during build #3647
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Motivation
Follow-up of #3603.
Fix HTML issue reported by Rocket Validator (CSS: “height”: Too many values or values are not recognized)
Explanation: this happens because during the build website currently calculate mobile dropdown height for work of CSS transition, but the element does not exist on prerendering, so we get
undefined.Have you read the Contributing Guidelines on pull requests?
Yes
Test Plan
Preview (see source code)
Related PRs
(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)