Browser compatibility test

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1

However sitepoint reference now offers browser compatibility table for almost all major browsers, and apart from this there are other sites like quirksmode.org provides browser compatibility tables.

My question is how do you experts test the browser compatibility of a HTML/CSS/JS property or attribute?

Thanks,

2

Create a webpage that uses that feature, view the page in the browser you want to test, and see if the rendered page conforms to the standard.