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Example: <div style="padding-left: 1.5em;"> ... When doing Select Identifier or Select Word within "left", then "left:" becomes selected, i.e. including the colon. Likewise, when doing Ctrl+Shift+Right within left, the colon gets included in the selection. Expected behavior would be to just select "left", or (for Select Identifier/Select Word) "padding-left". The editor doesn't necessarily need to know that this is CSS, just that it is within an attribute value, hence trying to match namespaced HTML tag names doesn't make sense there.
The top level language's select identifier handling is used regardless what the current embedding is.
In the html case the HtmlSettingsFactory.HTML_IDENTIFIER_ACCEPTOR is used by the editor infrastructure to figure out what is and what isn't a part of "identifier". As for html tags, the colon should be a part of the tag's name when there's a namespace prefix. I'm affraid this issues should be resolved at the editor's level by making the identifier acceptor - infrastructure language embedding aware.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss
Still reproducable in current dev build.