Compatible with HTML contenteditable element

[ccloli]

This PR should compatible with rich text editor.

HTML part example:

<div id="editor" contenteditable="true">
    Made by <a href="https://www.anotherhome.net/" target="_blank">DIYgod</a>. Available on <a href="https://github.com/DIYgod/OwO" target="_blank">GitHub</a>. Licensed MIT.
</div>
<div id="OwO"></div>

Example screenshot: