Most developers know HTML bold and italic tags. But what happens when your text lands in an environment that strips all HTML — WhatsApp, Discord DMs, plain text emails, or Instagram captions?

The answer: Unicode mathematical characters.

Why Unicode Styling Works Everywhere

Unicode includes dedicated ranges for bold, italic, bold-italic, and styled variants of Latin letters. These are not formatting instructions — they are different characters that happen to look styled.

Regular: Hello World Bold: 𝗛𝗲𝗹𝗹𝗼 𝗪𝗼𝗿𝗹𝗱 Italic: 𝘏𝘦𝘭𝘭𝘰 𝘞𝘰𝘳𝘭𝘥 Strike: H̶e̶l̶l̶o̶ ̶W̶o̶r̶l̶d̶

Enter fullscreen mode

Exit fullscreen mode

Because they are actual characters, they survive:

Copy-paste into any app

Plain text environments

WhatsApp, Discord, Instagram, Telegram

SMS on modern phones

LinkedIn posts (which strip HTML completely)

The Unicode Ranges

Mathematical Bold — starts at U+1D400

// Offset for bold lowercase 'a' = U+1D41A const BOLD_OFFSET_LOWER = 0x1D41A - ' a ' .…