смотрим на жуквери, никаких проверок на window.opera или на window.activeX
(function(){
jQuery.support = {};
var root = document.documentElement,
script = document.createElement("script"),
div = document.createElement("div"),
id = "script" + (new Date).getTime();
div.style.display = "none";
div.innerHTML = ' <link/><table></table><a href="/a" style="color:red;float:left;opacity:.5;">a</a><select><option>text</option></select><object><param/></object>';
var all = div.getElementsByTagName("*"),
a = div.getElementsByTagName("a")[0];
// Can't get basic test support
if ( !all || !all.length || !a ) {
return;
}
jQuery.support = {
// IE strips leading whitespace when .innerHTML is used
leadingWhitespace: div.firstChild.nodeType == 3,
// Make sure that tbody elements aren't automatically inserted
// IE will insert them into empty tables
tbody: !div.getElementsByTagName("tbody").length,
// Make sure that you can get all elements in an <object> element
// IE 7 always returns no results
objectAll: !!div.getElementsByTagName("object")[0]
.getElementsByTagName("*").length,
// Make sure that link elements get serialized correctly by innerHTML
// This requires a wrapper element in IE
htmlSerialize: !!div.getElementsByTagName("link").length,
// Get the style information from getAttribute
// (IE uses .cssText insted)
style: /red/.test( a.getAttribute("style") ),
// Make sure that URLs aren't manipulated
// (IE normalizes it by default)
hrefNormalized: a.getAttribute("href") === "/a",
// Make sure that element opacity exists
// (IE uses filter instead)
opacity: a.style.opacity === "0.5",
// Verify style float existence
// (IE uses styleFloat instead of cssFloat)
cssFloat: !!a.style.cssFloat,
// Will be defined later
scriptEval: false,
noCloneEvent: true,
boxModel: null
};
script.type = "text/javascript";
try {
script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
} catch(e){}
root.insertBefore( script, root.firstChild );
// Make sure that the execution of code works by injecting a script
// tag with appendChild/createTextNode
// (IE doesn't support this, fails, and uses .text instead)
if ( window[ id ] ) {
jQuery.support.scriptEval = true;
delete window[ id ];
}
root.removeChild( script );
if ( div.attachEvent && div.fireEvent ) {
div.attachEvent("onclick", function(){
// Cloning a node shouldn't copy over any
// bound event handlers (IE does this)
jQuery.support.noCloneEvent = false;
div.detachEvent("onclick", arguments.callee);
});
div.cloneNode(true).fireEvent("onclick");
}
// Figure out if the W3C box model works as expected
// document.body must exist before we can do this
jQuery(function(){
var div = document.createElement("div");
div.style.width = div.style.paddingLeft = "1px";
document.body.appendChild( div );
jQuery.boxModel = jQuery.support.boxModel = div.offsetWidth === 2;
document.body.removeChild( div ).style.display = 'none';
});
})();
