Steps to replicate the issue (include links if applicable):

• Create a document with <math> \strokeint </math> in Wikitext or with ... \intbar
• Set math appearance to SVG

What happens?:

• Bug TexVC validates, but strokeint is not parsed to MML:
• Message on Wikipage appears: Failed to parse (Conversion error. Server ("//en.wikipedia.beta.wmflabs.org/api/rest_") reported: "Cannot get mml. TeX parse error: Undefined control sequence \strokeint"): {\displaystyle \strokeint }

What should have happened instead?:

• either strokeint is not in validated commands in TexVC or it is rendered
• either intbar is not in validated commands in TexVC or it is rendered