<p>Specifically I think it is the <code>domParser.parseFromString</code> invocation at <a href="https://github.com/twbs/bootstrap/blob/master/js/src/util/sanitizer.js#L104">https://github.com/twbs/bootstrap/blob/master/js/src/util/sanitizer.js#L104</a> that is throwing, presumably because the <code>parseFromString</code> method is not supported.</p>

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