This is an extension which toggles HTML file whitespace.
It converts
/>(\r?\n\s*)</g
--> $1><
and reverts it back by
/(\r?\n\s*)></g
--> >$1<
.
The extension will default to the first conversion if the file has mixed whitespace.
The default keyboard shortcut to both convert and revert is
Ctrl+Shift+J
.