Script that loads maidr.js from the CDN, falling back to the page's copy

Goes into a chart frame's srcdoc in place of a plain CDN <script>. When the CDN load fails – offline, blocked – it looks in the parent document for the copy maidr_page_bundle_dependency() put there. A srcdoc frame shares its parent's origin, so it can read it.

Usage

maidr_cdn_loader_script(cdn_js_url)

Arguments

cdn_js_url

URL of maidr.js on the CDN

Value

Character string holding a <script> element

Details

The copy arrives in one of two shapes, and both are handled: a src (the _files folder, or a data: URL) or inline text, which is what pandoc turns a script into when it embeds it. maidr.js initialises itself when it runs, so nothing is called once it has loaded. KaTeX, which it fetches only when an AI response carries maths, is pointed at the page's copy through window.maidrMathStylesheetUrl, or added as a <style> when inline.