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],
17 select = document.createElement("select"),
18 opt = select.appendChild( document.createElement("option") );
20 // Can't get basic test support
21 if ( !all || !all.length || !a ) {
26 // IE strips leading whitespace when .innerHTML is used
27 leadingWhitespace: div.firstChild.nodeType === 3,
29 // Make sure that tbody elements aren't automatically inserted
30 // IE will insert them into empty tables
31 tbody: !div.getElementsByTagName("tbody").length,
33 // Make sure that link elements get serialized correctly by innerHTML
34 // This requires a wrapper element in IE
35 htmlSerialize: !!div.getElementsByTagName("link").length,
37 // Get the style information from getAttribute
38 // (IE uses .cssText insted)
39 style: /red/.test( a.getAttribute("style") ),
41 // Make sure that URLs aren't manipulated
42 // (IE normalizes it by default)
43 hrefNormalized: a.getAttribute("href") === "/a",
45 // Make sure that element opacity exists
46 // (IE uses filter instead)
47 // Use a regex to work around a WebKit issue. See #5145
48 opacity: /^0.55$/.test( a.style.opacity ),
50 // Verify style float existence
51 // (IE uses styleFloat instead of cssFloat)
52 cssFloat: !!a.style.cssFloat,
54 // Make sure that if no value is specified for a checkbox
55 // that it defaults to "on".
56 // (WebKit defaults to "" instead)
57 checkOn: div.getElementsByTagName("input")[0].value === "on",
59 // Make sure that a selected-by-default option has a working selected property.
60 // (WebKit defaults to false instead of true, IE too, if it's in an optgroup)
61 optSelected: opt.selected,
63 // Will be defined later
71 // Make sure that the options inside disabled selects aren't marked as disabled
72 // (WebKit marks them as diabled)
73 select.disabled = true;
74 jQuery.support.optDisabled = !opt.disabled;
76 script.type = "text/javascript";
78 script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
81 root.insertBefore( script, root.firstChild );
83 // Make sure that the execution of code works by injecting a script
84 // tag with appendChild/createTextNode
85 // (IE doesn't support this, fails, and uses .text instead)
87 jQuery.support.scriptEval = true;
91 root.removeChild( script );
93 if ( div.attachEvent && div.fireEvent ) {
94 div.attachEvent("onclick", function click() {
95 // Cloning a node shouldn't copy over any
96 // bound event handlers (IE does this)
97 jQuery.support.noCloneEvent = false;
98 div.detachEvent("onclick", click);
100 div.cloneNode(true).fireEvent("onclick");
103 div = document.createElement("div");
104 div.innerHTML = "<input type='radio' name='radiotest' checked='checked'/>";
106 var fragment = document.createDocumentFragment();
107 fragment.appendChild( div.firstChild );
109 // WebKit doesn't clone checked state correctly in fragments
110 jQuery.support.checkClone = fragment.cloneNode(true).cloneNode(true).lastChild.checked;
112 // Figure out if the W3C box model works as expected
113 // document.body must exist before we can do this
115 var div = document.createElement("div");
116 div.style.width = div.style.paddingLeft = "1px";
118 document.body.appendChild( div );
119 jQuery.boxModel = jQuery.support.boxModel = div.offsetWidth === 2;
120 document.body.removeChild( div ).style.display = 'none';
124 // Technique from Juriy Zaytsev
125 // http://thinkweb2.com/projects/prototype/detecting-event-support-without-browser-sniffing/
126 var eventSupported = function( eventName ) {
127 var el = document.createElement("div");
128 eventName = "on" + eventName;
130 var isSupported = (eventName in el);
131 if ( !isSupported ) {
132 el.setAttribute(eventName, "return;");
133 isSupported = typeof el[eventName] === "function";
140 jQuery.support.submitBubbles = eventSupported("submit");
141 jQuery.support.changeBubbles = eventSupported("change");
143 // release memory in IE
144 root = script = div = all = a = null;
149 "class": "className",
150 readonly: "readOnly",
151 maxlength: "maxLength",
152 cellspacing: "cellSpacing",
155 tabindex: "tabIndex",
157 frameborder: "frameBorder"