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This plugin adds an editor button that will let you use the great CodeMirror editor to edit the HTML code of your posts.
This editor supports code coloring and automatic tag closing on a big editor that will let you write beautiful code on your WordPress posts.
Probably the best choice if you need to use complex HTML on your posts, or just enjoy writing in plain HTML.
Screenshots
You can use the CodeMirror editor activating the editor toolbar icon
The editor opens on a big and wide dialog, so you can focus on your code