Like this.

<button class="" disabled></button> // remove empty class and keep other attr like disabled
<div class=" a b "></div> // remove whitespace around quote
<div class="a  b"></div> // remove double space inside class

This is the result I want, i need to format html file but not minify.

<button disabled></button> // remove empty class and keep other attr like disabled
<div class="a b"></div> // remove whitespace around quote
<div class="a b"></div> // remove double space inside class

I tried some html format plugins but failed, hope you can recommend some plugins to me, thank you.