# Regex-injecting chrome into arbitrary author HTML

_2026-09-21 · booth_

**Regex-injecting chrome into arbitrary author HTML**
(`wrap_verbatim_html` + `_HEAD_CLOSE_RE`, `_HTML_OPEN_RE`, `_DOCTYPE_RE`,
`_BODY_CLOSE_RE`, `_HTML_CLOSE_RE`, `_ICON_RE`, and the doctype/charset
ordering constraints they thread). It works today and is **still live** —
but it is the single most fragile thing in the service and it is load-bearing
for the operator's most important workflow. Slated for deletion at U3 in
favour of a declared seam (`/_booth/embed.js`, mounted through a real DOM
API), which costs an author one line and removes the whole class. Do not
extend the regex set in the meantime; if a verbatim page breaks, that is an
argument for U3, not for a seventh pattern.