https://wpt.fyi/results/mathml/relations?label=experimental&label=master&aligned #5525
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closes #5513 as per resolution from the minutes there documenting reality of what is shipping.
Previously MathML elements didn't specify IDL, but now they do and are widely shipping - Lots of tests in https://wpt.fyi/results/mathml/relations?label=experimental&label=master&aligned make use of this.