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function setupIframe() {
var iframe = document.querySelector('iframe');
var html = "<style id=style></style><div id=test></div><div id=ref></div><svg><circle id=svg /><circle id=svg_ref /></svg>";
if (iframe.className === "limited-quirks") {
html = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">' + html;
} else if (iframe.className === "no-quirks") {
html = '<!DOCTYPE HTML>' + html;
}
window.quirks = iframe.className === "quirks";
window.win = iframe.contentWindow;
win.document.open();
win.document.write(html);
win.document.close();
['style', 'test', 'ref', 'svg', 'svg_ref'].forEach(function(id) {
win[id] = win.document.getElementById(id);
});
}