What HTML is allowed in GitHub issues?

github, github-flavored-markdown

Solution

Github has open sourced their text processing pipeline. The definition of the tag whitelist can be found in the jch/html-pipeline repository.

At the time of writing, they allow the following tags along with common attributes (see the linked code for the exact details):

h1 h2 h3 h4 h5 h6 h7 h8 br b i strong em a pre code img tt
div ins del sup sub p ol ul table thead tbody tfoot blockquote
dl dt dd kbd q samp var hr ruby rt rp li tr td th s strike

Problem

Along with Markdown, GitHub allows "some HTML" when you compose issues, pull requests, and comments. Is there a full list of exactly which HTML tags are allowed on GitHub? (similar to What HTML tags are allowed on Stack Exchange sites?)

Original source