Core: Drop workarounds for IE <9

Fixes #89

Author: mgol

README.md

@@ -4,7 +4,7 @@
 
 ## Browser Support
 
-jQuery color is tested on the same browsers a jQuery Core 1.x versions. [Check it](http://swarm.jquery.org/project/jquerycolor)
+jQuery color is tested on the same browsers a jQuery Core 3.x versions. [Check it](http://swarm.jquery.org/project/jquerycolor)
 
 ## Using jQuery Color in Production
 We release jQuery Color by itself, or in a bundle.  The extended names can be included as a jQuery Color plugin, or you can download the version of jQuery Color that includes the names.  Choose your build from the following list:

jquery.color.js

@@ -131,21 +131,13 @@
 			floor: true
 		}
 	},
-	support = color.support = {},
-
-	// element for support tests
-	supportElem = jQuery( "<p>" )[ 0 ],
 
 	// colors = jQuery.Color.names
 	colors,
 
 	// local aliases of functions called often
 	each = jQuery.each;
 
-// determine rgba support immediately
-supportElem.style.cssText = "background-color:rgba(1,1,1,.5)";
-support.rgba = supportElem.style.backgroundColor.indexOf( "rgba" ) > -1;
-
 // define cache name and alpha properties
 // for rgba and hsla spaces
 each( spaces, function( spaceName, space ) {
@@ -167,12 +159,6 @@ function clamp( value, prop, allowEmpty ) {
 	// ~~ is an short way of doing floor for positive numbers
 	value = type.floor ? ~~value : parseFloat( value );
 
-	// IE will pass in empty strings as value for alpha,
-	// which will hit this case
-	if ( isNaN( value ) ) {
-		return prop.def;
-	}
-
 	if ( type.mod ) {
 		// we add mod before modding to make sure that negatives values
 		// get converted properly: -10 -> 350
@@ -420,8 +406,7 @@ color.fn = jQuery.extend( color.prototype, {
 		return "#" + jQuery.map( rgba, function( v ) {
 
 			// default to 0 when nulls exist
-			v = ( v || 0 ).toString( 16 );
-			return v.length === 1 ? "0" + v : v;
+			return ( "0" + ( v || 0 ).toString( 16 ) ).substr( -2 );
 		}).join("");
 	},
 	toString: function() {
@@ -586,36 +571,13 @@ color.hook = function( hook ) {
 	each( hooks, function( i, hook ) {
 		jQuery.cssHooks[ hook ] = {
 			set: function( elem, value ) {
-				var parsed, curElem,
-					backgroundColor = "";
+				var parsed;
 
 				if ( value !== "transparent" && ( jQuery.type( value ) !== "string" || ( parsed = stringParse( value ) ) ) ) {
 					value = color( parsed || value );
-					if ( !support.rgba && value._rgba[ 3 ] !== 1 ) {
-						curElem = hook === "backgroundColor" ? elem.parentNode : elem;
-						while (
-							(backgroundColor === "" || backgroundColor === "transparent") &&
-							curElem && curElem.style
-						) {
-							try {
-								backgroundColor = jQuery.css( curElem, "backgroundColor" );
-								curElem = curElem.parentNode;
-							} catch ( e ) {
-							}
-						}
-
-						value = value.blend( backgroundColor && backgroundColor !== "transparent" ?
-							backgroundColor :
-							"_default" );
-					}
-
 					value = value.toRgbaString();
 				}
-				try {
-					elem.style[ hook ] = value;
-				} catch( e ) {
-					// wrapped to prevent IE from throwing errors on "invalid" values like 'auto' or 'inherit'
-				}
+				elem.style[ hook ] = value;
 			}
 		};
 		jQuery.fx.step[ hook ] = function( fx ) {