ensure support for browsers without manual slot assignment #82
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keithamus
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I was testing this out in some older browsers and found that some (Safari 15) don't support manual slot assignment. We should endeavour to ensure older browsers work as best they can, and it's not too difficult to get manual slot assignment working in these older browsers, by simply mutating the
slot=attribute.So this detects if manual slot assignment is supported, and if not falls back to mutating
slot=.