Vim Wrong Indent When There Is Dash - in Html Tag

Question

When I have my custom html tag with the dash in it, Vim can't indent it correctly.

<my-tag>
<my-sub-tag>
    this is my tag
    </my-sub-tag>
    </my-tag>

Also if I remove the dash out, Vim also indents incorrectly.

<mytag>
<mysubtag>
this is my tag
</mysubtag>
</mytag>

Unless I have standard html tags, then VIM can indent it correctly like below:

<h1>
    <p>som text</p>
</h1>

So how can I force VIM to indent <my-tag> and <mytag> correctly like the standard HTML tag?

Thanks

Answer 1

I have tested html5.vim plugin and it solves this problem.