Ismail,
Thank you for loving Angular IDE.
We will take a look at the multiple selection support. I see the html tags being auto corrected while editing in the CodeMix HTML editor.
Is the file you are working with is purely html or a mix of any other language? Please recheck if the file is opened with CodeMix HTML editor.
If you are still seeing the problem, then please share with us the code snippet to help us replicate the issue at our end.
Happy New Year !
–Swapna
Genuitec Support