Supported tags
<b>,<i>,<u>,<s>for bold, italic, underline and strikethrough.<font color="#FF7800" size="40" weight="heavy" transparency="0.5">for color, size, weight and see-through text.<stroke color="#000000" thickness="2">for an outline around the text.<mark color="#FFFF00" transparency="0.5">for a highlight behind the text.<uc>for uppercase,<sc>for small caps, and<br />for a line break.
The preview approximates Roblox's rendering. Fonts and stroke thickness look slightly different in-game.