7 var root = document.documentElement,
8 script = document.createElement("script"),
9 div = document.createElement("div"),
10 id = "script" + jQuery.now();
12 div.style.display = "none";
13 div.innerHTML = " <link/><table></table><a href='/a' style='color:red;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
15 var all = div.getElementsByTagName("*"),
16 a = div.getElementsByTagName("a")[0];
18 // Can't get basic test support
19 if ( !all || !all.length || !a ) {
23 var select = document.createElement("select");
24 var opt = select.appendChild( document.createElement("option") );
27 // IE strips leading whitespace when .innerHTML is used
28 leadingWhitespace: div.firstChild.nodeType === 3,
30 // Make sure that tbody elements aren't automatically inserted
31 // IE will insert them into empty tables
32 tbody: !div.getElementsByTagName("tbody").length,
34 // Make sure that link elements get serialized correctly by innerHTML
35 // This requires a wrapper element in IE
36 htmlSerialize: !!div.getElementsByTagName("link").length,
38 // Get the style information from getAttribute
39 // (IE uses .cssText insted)
40 style: /red/.test( a.getAttribute("style") ),
42 // Make sure that URLs aren't manipulated
43 // (IE normalizes it by default)
44 hrefNormalized: a.getAttribute("href") === "/a",
46 // Make sure that element opacity exists
47 // (IE uses filter instead)
48 // Use a regex to work around a WebKit issue. See #5145
49 opacity: /^0.55$/.test( a.style.opacity ),
51 // Verify style float existence
52 // (IE uses styleFloat instead of cssFloat)
53 cssFloat: !!a.style.cssFloat,
55 // Make sure that if no value is specified for a checkbox
56 // that it defaults to "on".
57 // (WebKit defaults to "" instead)
58 checkOn: div.getElementsByTagName("input")[0].value === "on",
60 // Make sure that a selected-by-default option has a working selected property.
61 // (WebKit defaults to false instead of true, IE too, if it's in an optgroup)
62 optSelected: opt.selected,
64 // Will be defined later
72 // Make sure that the options inside disabled selects aren't marked as disabled
73 // (WebKit marks them as diabled)
74 select.disabled = true;
75 jQuery.support.optDisabled = !opt.disabled;
77 script.type = "text/javascript";
79 script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
82 root.insertBefore( script, root.firstChild );
84 // Make sure that the execution of code works by injecting a script
85 // tag with appendChild/createTextNode
86 // (IE doesn't support this, fails, and uses .text instead)
88 jQuery.support.scriptEval = true;
92 root.removeChild( script );
94 if ( div.attachEvent && div.fireEvent ) {
95 div.attachEvent("onclick", function click() {
96 // Cloning a node shouldn't copy over any
97 // bound event handlers (IE does this)
98 jQuery.support.noCloneEvent = false;
99 div.detachEvent("onclick", click);
101 div.cloneNode(true).fireEvent("onclick");
104 div = document.createElement("div");
105 div.innerHTML = "<input type='radio' name='radiotest' checked='checked'/>";
107 var fragment = document.createDocumentFragment();
108 fragment.appendChild( div.firstChild );
110 // WebKit doesn't clone checked state correctly in fragments
111 jQuery.support.checkClone = fragment.cloneNode(true).cloneNode(true).lastChild.checked;
113 // Figure out if the W3C box model works as expected
114 // document.body must exist before we can do this
116 var div = document.createElement("div");
117 div.style.width = div.style.paddingLeft = "1px";
119 document.body.appendChild( div );
120 jQuery.boxModel = jQuery.support.boxModel = div.offsetWidth === 2;
121 document.body.removeChild( div ).style.display = 'none';
125 // Technique from Juriy Zaytsev
126 // http://thinkweb2.com/projects/prototype/detecting-event-support-without-browser-sniffing/
127 var eventSupported = function( eventName ) {
128 var el = document.createElement("div");
129 eventName = "on" + eventName;
131 var isSupported = (eventName in el);
132 if ( !isSupported ) {
133 el.setAttribute(eventName, "return;");
134 isSupported = typeof el[eventName] === "function";
141 jQuery.support.submitBubbles = eventSupported("submit");
142 jQuery.support.changeBubbles = eventSupported("change");
144 // release memory in IE
145 root = script = div = all = a = null;
150 "class": "className",
151 readonly: "readOnly",
152 maxlength: "maxLength",
153 cellspacing: "cellSpacing",
156 tabindex: "tabIndex",
158 frameborder: "frameBorder"