Auto merge of #29667 - Loirooriol:test-failures, r=mrobinson

Expect some tests to fail in layout-2020

sslfail.html and websocket_disconnect.html are already expected to fail in layout-2013.

text-indent-percentage-001.xht and text-indent-tab-positions-001.html fail in layout-2020 due to lack of support for text-indent and tabs.

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