Per the Source Map spec §6.2:
There are two suggested ways to link source maps to the output. The first requires a server support to add a HTTP header and the second requires an annotation in the source.
The HTTP header should supply the source map URL reference as:
SourceMap: <url>[…] The generated code should include a line at the end of the source, with the following form: […]
This recommendation works well for JavaScript, it is expected that other source files will have different conventions. For instance, for CSS
/*# sourceMappingURL=<url> */is proposed.
What is the corresponding convention for HTML? My guesses:
<!--# sourceMappingUrl=<url> -->after</html>. (Most likely.)<meta http-equiv="SourceMap" content="<url>" />in<head>.- Mysterious third option.
(Answers to a 2013 question suggest there is no browser support for HTML sourcemaps. I care little for browser support, but I do care for convention.)