fix: add test case for ios13 z order bug. #11541
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The bug is fixed in: ecomfe/zrender#522 IOS13 safari probably has a compositing bug (z order of the canvas and the consequent dom does not act as expected) when some of the parent dom has `-webkit-overflow-scrolling: touch;` and the webpage is longer than one screen and the canvas is not at the top part of the page. Check `https://bugs.webkit.org/show_bug.cgi?id=203681` for more details.
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The bug is fixed in: ecomfe/zrender#522
IOS13 safari probably has a compositing bug (z order of the canvas and the consequent
dom does not act as expected) when some of the parent dom has
-webkit-overflow-scrolling: touch;and the webpage is longer than one screen andthe canvas is not at the top part of the page.
Check
https://bugs.webkit.org/show_bug.cgi?id=203681for more details.