Support for coloring font tag in preview

[Shigenori-Sagawa-nm]

Current behavior

In preview coloring font tag is not work.

Expected behavior

Support for coloring font tag in preview.

This is <span style="color: red;">red</span> color.

This is <font color="red">red</font> color.

Environment

• Version : 0.12.1 (0.12.1)
• OS Version and name : macOS Mojava 10.14.6

[Flexo013]

These tags are already supported:

Make sure that you have HTML tags allowed in your preferences.