Fix #11721. Remove jQuery.boxModel, deprecate jQuery.support.boxModel.

This removes all internal uses of `jQuery.support.boxModel`. jQuery has never run unit tests with Quirks Mode and has not even feigned support for several years, so these remnants weren't doing much except giving false hope.

For now, `jQuery.support.boxModel` continues to have a value indicating whether the W3C box model is *generally* in use, but be aware that this is easily overridden on an element-by-element basis by the `box-model` CSS property. So don't trust this value.

src/effects.js

@@ -681,7 +681,7 @@ function defaultDisplay( nodeName ) {
 		// document to it; WebKit & Firefox won't allow reusing the iframe document.
 		if ( !iframeDoc || !iframe.createElement ) {
 			iframeDoc = ( iframe.contentWindow || iframe.contentDocument ).document;
-			iframeDoc.write( ( jQuery.support.boxModel ? "<!doctype html>" : "" ) + "<html><body>" );
+			iframeDoc.write("<!doctype html><html><body>");
 			iframeDoc.close();
 		}
 

src/offset.js

@@ -20,8 +20,8 @@ if ( "getBoundingClientRect" in document.documentElement ) {
 			win = getWindow( doc ),
 			clientTop  = docElem.clientTop  || body.clientTop  || 0,
 			clientLeft = docElem.clientLeft || body.clientLeft || 0,
-			scrollTop  = win.pageYOffset || jQuery.support.boxModel && docElem.scrollTop  || body.scrollTop,
-			scrollLeft = win.pageXOffset || jQuery.support.boxModel && docElem.scrollLeft || body.scrollLeft,
+			scrollTop  = win.pageYOffset || docElem.scrollTop,
+			scrollLeft = win.pageXOffset || docElem.scrollLeft,
 			top  = box.top  + scrollTop  - clientTop,
 			left = box.left + scrollLeft - clientLeft;
 
@@ -176,8 +176,7 @@ jQuery.each( {scrollLeft: "pageXOffset", scrollTop: "pageYOffset"}, function( me
 
 			if ( val === undefined ) {
 				return win ? (prop in win) ? win[ prop ] :
-					jQuery.support.boxModel && win.document.documentElement[ method ] ||
-						win.document.body[ method ] :
+					win.document.documentElement[ method ] :
 					elem[ method ];
 			}
 

src/support.js

@@ -95,8 +95,8 @@ jQuery.support = (function() {
 		boxSizingReliable: true
 	};
 
-	// jQuery.boxModel DEPRECATED in 1.3, use jQuery.support.boxModel instead
-	jQuery.boxModel = support.boxModel = (document.compatMode === "CSS1Compat");
+	// jQuery.support.boxModel DEPRECATED in 1.8 since we don't support Quirks Mode
+	support.boxModel = (document.compatMode === "CSS1Compat");
 
 	// Make sure checked status is properly cloned
 	input.checked = true;

test/data/support/boxModelIE.html

-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd">
-<html>
-<body>
-	<script src="../include_js.php"></script>
-	<script>
-	jQuery(function() { window.parent.iframeCallback( document.compatMode, jQuery.support.boxModel ) });
-	</script>
-</body>
-</html>

test/unit/offset.js

@@ -342,7 +342,7 @@ testIframe("offset/table", "table", function( jQuery ) {
 });
 
 testIframe("offset/scroll", "scroll", function( jQuery, win ) {
-	expect(24);
+	expect(26);
 
 	var ie = jQuery.browser.msie && parseInt( jQuery.browser.version, 10 ) < 8;
 
@@ -397,6 +397,12 @@ testIframe("offset/scroll", "scroll", function( jQuery, win ) {
 	notEqual( jQuery().scrollLeft(null), null, "jQuery().scrollLeft(null) testing setter on empty jquery object" );
 	strictEqual( jQuery().scrollTop(), null, "jQuery().scrollTop(100) testing setter on empty jquery object" );
 	strictEqual( jQuery().scrollLeft(), null, "jQuery().scrollLeft(100) testing setter on empty jquery object" );
+
+	// test setting scroll
+	jQuery( win ).scrollTop( 100 );
+	jQuery( win ).scrollLeft( 101 );
+	equal( jQuery( win ).scrollTop(), 100, "jQuery( win ).scrollTop() testing setter" );
+	equal( jQuery( win ).scrollLeft(), 101, "jQuery( win ).scrollLeft() testing setter" );
 });
 
 testIframe("offset/body", "body", function( jQuery ) {

test/unit/support.js

 module("support", { teardown: moduleTeardown });
 
-testIframeWithCallback( "proper boxModel in compatMode CSS1Compat (IE6 and IE7)", "support/boxModelIE", function( compatMode, boxModel ) {
-	ok( compatMode !== "CSS1Compat" || boxModel, "boxModel properly detected" );
-});
+ok( jQuery.support.boxModel, "jQuery.support.boxModel is perpetually true since 1.8" );
 
 testIframeWithCallback( "body background is not lost if set prior to loading jQuery (#9238)", "support/bodyBackground", function( color, support ) {
 	expect( 2 );