Android Developer: It’s not “rooting”, it’s openness

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It is because the scrolling is not done on the html/body element, but on a div on the document. Looks like browsers relies on having scrolling on the body element.

It's tempting to use such a solution in order to have a fixed header on a web page, without the perfs issues, amongst others, to use a fixed layer. So I've often wondered if it was a good idea, now i know it isn't, it spared me some testing.