Atom HTMLHint

Features

Validate on keymap
Validate on command
Validate on save (toggle in settings)
Validate on change (toggle in settings)
Option to hide the error panel if no errors were found (toggle in settings)
Option to use fold mode by default (toggle in settings)
Supports .htmlhintrc config files (project located file will overwrite the global file)

You can install this plugin via the Packages manager in Atom itself or manually through the terminal

$ apm install htmlhint

HTMLHint is by default validating on save (this can be changed in the package settings), you can also execute it by hitting ctrl-alt-l.

If you like you can even set it to validate while typing in the package settings.

Project initially created by @tcarlsen and transferred to the HTMLHint organization.