By default Nuxt Content Plugin not handling <span class="highlight">highlight</span> links. To fix that we will create Nitro plugin:
// ~/server/plugins/highlight.tsexport default defineNitroPlugin((nitroApp) => { nitroApp.hooks.hook("content:file:beforeParse" if (file._id.endsWith(".md")) { file.body = file.body.replace( /==([^=]+)==/gs, `<span class="highlight">$1</span>` ); } });});