Correct oldIE-related comments, revert some workarounds. Close gh-1207.

CONTRIBUTING.md

@@ -207,10 +207,12 @@ This will only run the "css" module tests. This will significantly speed up your
 **ALWAYS RUN THE FULL SUITE BEFORE COMMITTING AND PUSHING A PATCH!**
 
 
-### jQuery supports the following browsers:
+### jQuery 2.x supports the following browsers:
 
 * Chrome Current-1
 * Safari Current-1
 * Firefox Current-1
-* IE 6+
+* IE 9+
 * Opera Current-1
+
+jQuery 1.x additionally supports IE6+.

src/ajax.js

@@ -8,7 +8,7 @@ var
 	ajax_rquery = /\?/,
 	rhash = /#.*$/,
 	rts = /([?&])_=[^&]*/,
-	rheaders = /^(.*?):[ \t]*([^\r\n]*)\r?$/mg, // IE leaves an \r character at EOL
+	rheaders = /^(.*?):[ \t]*([^\r\n]*)$/mg,
 	// #7653, #8125, #8152: local protocol detection
 	rlocalProtocol = /^(?:about|app|app-storage|.+-extension|file|res|widget):$/,
 	rnoContent = /^(?:GET|HEAD)$/,

src/attributes.js

@@ -23,11 +23,8 @@ jQuery.fn.extend({
 	removeProp: function( name ) {
 		name = jQuery.propFix[ name ] || name;
 		return this.each(function() {
-			// try/catch handles cases where IE balks (such as removing a property on window)
-			try {
-				this[ name ] = undefined;
-				delete this[ name ];
-			} catch( e ) {}
+			this[ name ] = undefined;
+			delete this[ name ];
 		});
 	},
 
@@ -249,7 +246,7 @@ jQuery.extend({
 				for ( ; i < max; i++ ) {
 					option = options[ i ];
 
-					// oldIE doesn't update selected after form reset (#2551)
+					// IE6-9 doesn't update selected after form reset (#2551)
 					if ( ( option.selected || i === index ) &&
 							// Don't return options that are disabled or in a disabled optgroup
 							( jQuery.support.optDisabled ? !option.disabled : option.getAttribute("disabled") === null ) &&

src/core.js

@@ -133,13 +133,7 @@ jQuery.fn = jQuery.prototype = {
 					// Check parentNode to catch when Blackberry 4.6 returns
 					// nodes that are no longer in the document #6963
 					if ( elem && elem.parentNode ) {
-						// Handle the case where IE and Opera return items
-						// by name instead of ID
-						if ( elem.id !== match[2] ) {
-							return rootjQuery.find( selector );
-						}
-
-						// Otherwise, we inject the element directly into the jQuery object
+						// Inject the element directly into the jQuery object
 						this.length = 1;
 						this[0] = elem;
 					}

src/effects.js

@@ -279,7 +279,7 @@ function defaultPrefilter( elem, props, opts ) {
 	// height/width overflow pass
 	if ( elem.nodeType === 1 && ( "height" in props || "width" in props ) ) {
 		// Make sure that nothing sneaks out
-		// Record all 3 overflow attributes because IE does not
+		// Record all 3 overflow attributes because IE9-10 do not
 		// change the overflow attribute when overflowX and
 		// overflowY are set to the same value
 		opts.overflow = [ style.overflow, style.overflowX, style.overflowY ];