1) create new html file from template
2) add id attribute to the div element in the body
3) type hello inside
4) move caret to the beginning of id attribute value (<div id="|hello"></div>)
5) invoke completion
=> code completion offers "hell"
6) save file
7) repeat from #5
=> cc offers "hello"
8) remove o from hello
9) repeat #5
=> cc still offers "hello"

-> the same problem happens if you do modifications of id/class selectors in embedded css code inside the same html page. The problem does NOT happen when the id/class is declared in a linked stylesheet.

The code completion content is "one char behind" of the actual content of the file. Eg. if anyone does a change in the value, the last char of the text edit is not taken into account.