CSS: What does "input[type="search"]::-webkit-search-decoration" do?

Question

I wonder what the the part ::-webkit-search-decoration do in the CSS selector for input[type="search"]::-webkit-search-decoration?

And why is this causing en DOM Exception error?

function is(selector, element) {
        var div = document.createElement("div"),
        matchesSelector = div.webkitMatchesSelector;
        return typeof selector == "string" ? matchesSelector.call(element, selector) : selector === element;
 }
 is('input[type="search"]::-webkit-search-decoration', document.body);

Answer 1

It allows you to make search boxes look uniform across multiple browsers. Chrome for instance has default styling for search boxes that does not fit into some designs.

here is a good link on the topic. http://geek.michaelgrace.org/2011/06/webkit-search-input-styling/