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What is worth writing about
A test that disagrees with your hardware is the most useful message this site can get. If a key lights up on your keyboard and not here, or a field of color shows something the page does not explain, that is a defect worth a reply.
So is a browser behaving differently from what a page claims. Every support table on this site was measured rather than remembered, but it was measured on three engines on one machine, and yours is not that machine.
Corrections to anything a page states are welcome without ceremony. The tests are built to say what they cannot do; a claim that turns out to be wider than the truth is the failure this site exists to avoid.