Follow the implementation of making DOMPoint and DOMPointReadOnly
serializable in PR #35989
Testing: Passed a test previously expected to fail.
Fixes: #36463
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Signed-off-by: Kingsley Yung <kingsley@kkoyung.dev>
Most tests were only being run for layout-2013, not for layout-2020.
This wasn't great since layout-2020 is now the default.
So this patch unifies the lists of included tests for both layouts.
For layout-2013 this implies adding css/css-content/, css/css-logical/
and css/css-masking/clip/.
For layout-2020 this implies adding several additional css tests, and
also tests like dom/, js/, html/, etc.