Add mode to use contenteditable as io

[inokawa]

Is your feature request related to a problem? Please describe.

Using textarea as io is suitable for most case, however there are several things impossible to do with textarea, such as changing font-size or adding padding to words.

Describe the solution you'd like

Add option to use contenteditable instead of textarea.

Describe alternatives you've considered

Nothing.

Additional context

Nothing.

[aeharding]

I would love this. I discussed this a couple months ago, lamenting how nothing like this exists for the web. This library gets close — but it would be great to have the ability to change font size and font weight as well.

[inokawa]

https://github.com/yuneco/canvas-draw-styled-text

[inokawa]

w3c/csswg-drafts#4603