html5-elements-tester
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A page containing HTML elements that you can use for testing purposes
Allow to define in URL query the CSS to be used for the test.
It can be useful to test, as W3 calls it [in the HTML specification](https://www.w3.org/TR/2017/REC-html52-20171214/single-page.html#common-idioms-without-dedicated-elements); *"common idioms without dedicated elements"*, such as subtitles, footnotes, etc.
Some HTML element attributes might be interesting to test as well, such as `hidden`, and some ARIA attributes.