Description

A new option was introduced in #36302 called html which validates if the color respects HTML rules about hexadecimal colors. This takes into account colors like #FFFFFF or #06CD8E.

However, it is very common to find colors formatted like the following example: #FFF. But this format isn't valid in the ColorType. Perhaps, it will be nice to have the support of this format.
Moreover, there is another format, less popular, which takes into account the alpha channel: #FFFFFFDD but I don't know if it is worth to support it.