tagName property
The tagName read-only property
of the Element interface returns the tag name of the element on which
it's called.
For example, if the element is an img, its
tagName property is IMG (for HTML documents; it may be cased
differently for XML/XHTML documents). Note: You can use the
Element.localName property
to access the Element's local name — which for the case in the example is
img (lowercase) .
Implementation
external String get tagName;