[DiapDealer]

The noparse thing works. I use it to display entity codes all the time. Just leave the ampersand outside of the tags and the rest inside.

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As far as making all text between the entities blue in an epub, there's no shortcut. You'll have to create 32k spans or 32k inline styles. There is no entity element that can be utilized by css. Nor any (pseudo-)selectors to specify "between elements x and y" even if there were.