Pure HTML allows you to add standard HTML markup that is normally removed by the visual editor using a bbcode format or code snippets
Currently all <br /> and <p> (and its closing counterpart) tags are removed from the input code because these are the tags that WordPress automatically add.
If you want to echo a paragraph tag or a line break, or any other tag (strong, em etc) instead of enclosing them in < and > tags, enclose them in [ ] brackets for example [p] instead of <p> The square brackets are converted after the inital tags are stripped and function as normal tags.
To prevent [ or ] being changed to the < or > (respectively) you will need to
escape it using a \, so ] will become ] and [ will become [.
If you delete a snippet that is being used in a page then the output generates a 404 error that displays in its place.
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