Question

Netbeans, my IDE, marks this CSS as incorrect, but I can’t tell the problem. I can’t find anything that says contains-element is specific to CSS3, but the styling doesn’t show up in Firefox or Opera.

CSS:

span:contains-element(input[type="radio"]) {
    border:1px solid black;
}

HTML:

<span><input type="radio" name="amount" value="Cash amount"/>Cash amount</span>

Answer 1

:contains-element isn’t a CSS selector, as far as I know. Where did you get it from?

The fact that it doesn’t exist explains why it doesn’t work in browsers and Netbeans marks it as incorrect.

That looks like an attempted “parent selector” (maybe from some JavaScript library?) and as always, there is no parent selector in CSS:

• Is there a CSS parent selector?
• Complex CSS selector for parent of active child

---

As pointed out by @Šime Vidas, that selector is specific to this product:

http://www.xmlmind.com/xmleditor//_distrib/doc/csssupport/containing_child.html

This document describes the subset of CSS2 supported by XXE, as well
as advanced “proprietary extensions” needed to style complex XML
documents.

http://www.xmlmind.com/xmleditor//_distrib/doc/csssupport/index.html