The doc comment for java.lang.String.split(String) contains an HTML table with inline inline style attribute containing the CSS rule "text-weight:normal". "text-weight" is not a valid CSS property name, the intended property is "font-weight"[1] which is also used in other doc comments in java.lang.String.

[1]: https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight

Another illegal CSS rule is "display:none:" (with a trailing colon instead of a semicolon) in the HTML table caption in the class doc comment in java.lang.Thread.