Language: TypeScript
Label: safe
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
    public function testBasicUse()
    {
        $this->assertResult(
            '<ruby><rb>WWW</rb><rt>World Wide Web</rt></ruby>'
        );
    }