This is a follow up fix for https://github.com/angular/angular/pull/40136/commits/894286dd0c92b5af223364237e63798e18b14f58. It turns out that comments can be closed in several ways: - `<!-->` - `<!-- -->` - `<!-- --!>` All of the above are valid ways to close comment per: https://html.spec.whatwg.org/multipage/syntax.html#comments The new fix surrounds `<` and `>` with zero width space so that it renders in the same way, but it prevents the comment to be closed eagerly. PR Close #40525