[V2] Parse error occur when heading contains < in mdx

[Kimi-Gao]

🐛 Bug Report

My docs site has broken since 2.0.0-alpha.40, if the heading(h1, h2, ...) contains <, <= in mdx , it will break when run yarn build but it works fine in the development environment.

Have you read the Contributing Guidelines on issues?

Yes

To Reproduce

1. Add this line in mdx:

## node < 8
....

or

## node < 8
....

2. Run yarn build

Expected behavior

build success

Actual Behavior

Reference

#2116

[endiliey]

Alpha40 introduced a html parser that validates HTML.

Adding

docusaurus/packages/docusaurus/src/client/serverEntry.js

Line 87 in 428e087

minifyJS: true,

    minifyJS: true,
+ continueOnParseError: true,

will let it the build pass, but its quite weird that this shows as parse error if not toggled. Any help is appreciated 😉

Maybe previously we're never HTML spec compliant

[edwandr]

After investigation i think it was related to the way EJS template was written : by using an escaped HTML tag instead of unescaped (cf https://github.com/tj/ejs#features) the build passed with a special character in title.

I've created a pull request, @endiliey do you think it's a good solution ?