You can use non-standard characters like β:β in CSS class names if you escape them with a backslash.
This is especially helpful when writing utility-first CSS like they do in Tailwind CSS. In Tailwind, things like breakpoints, dark mode, and pseudo selectors like hover are set with these kinds of prefixes.
<style>
.text\:italic {
font-style: italic;
}
.text\:uppercase {
text-transform: uppercase;
}
</style>
<p class="text:italic text:uppercase">
Italic and uppercase
</p>
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