[system] CSSVarsProvider cleans up html[style]
when unmounting
#29946
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Follow-up to #29929 (comment)
I adjusted the test descriptions since it sounded like the
body
element would be affected. However,document.documentElement
points to<html>
not<body>
(that would bedocoument.body
)Browser run: https://app.circleci.com/pipelines/github/mui-org/material-ui/57238/workflows/f8e8f5bb-04d8-4db2-990e-f7c0d7a2b75a