CSS selector: how to select non-element sibling node?

According to the specification here: http://www.w3.org/TR/CSS21/selector.html#adjacent-selectors

Adjacent sibling selectors have the following syntax: E1 + E2, where E2 is the subject of the selector. The selector matches if E1 and E2 share the same parent in the document tree and E1 immediately precedes E2, ignoring non-element nodes (such as text nodes and comments).

So how can we select the non-element sibling node. For example: in the following html, how can we select the "Non-element text" text?

<div><label>Some text here</label> Non-element text</div>