Allow common safe HTML5 elements and attributes.
This list is based off of the Caja whitelists at: https://code.google.com/p/google-caja/wiki/CajaWhitelists.
Common things which are not allowed are script elements, style attributes and any script handlers.
void allowHtml5({UriPolicy uriPolicy}) { add(new _Html5NodeValidator(uriPolicy: uriPolicy)); }
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https://api.dartlang.org/stable/2.0.0/dart-html/NodeValidatorBuilder/allowHtml5.html