Highlight

Wrap a phrase in double equals signs to highlight it. The renderer emits a <mark> element, and the color comes from the theme, so it is readable in every theme.

Rules

• The opening == must touch the first word and the closing == the last word, so x == y stays plain text.
• A highlight may contain emphasis, strong text, links and code, and may sit inside them.
• A highlight may span soft line breaks inside one paragraph. It cannot cross a blank line.
• Highlights are never applied inside inline code or fenced code.

A phrase

A preview of ==a new type of software solution.== that arrived early.

Strong text inside

==**Run the counterfactual as a smoke test.**== Then compare the numbers.

Across two lines

The sentence starts ==with a highlight that runs
across two source lines== and then ends normally.

Next to code

Inline code stays literal: `a ==b== c`, and ==a *nested emphasis* phrase== is fine.