Use element.localName over element.tagName.toLowerCase()
#696
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element.tagNamealways returns the elements tag name in all uppercase so we needed to cast it to all lower-case in order to fit our needs.In contrast,
element.localNamereturns the actual tag HTML name, so this is more accurate.Since we are already using
element.localNamein a few other places in the codebase and because of it's good browser-support it's much more preferable to use.