Use document.compatMode for quirks test in width/height method

diff --git a/src/core.js b/src/core.js
index 960af44..e3dc01c 100644 (file)
--- a/src/core.js
+++ b/src/core.js
@@ -1123,7 +1123,7 @@ jQuery.each( [ "Height", "Width" ], function(i,name){
                        jQuery.browser.safari && self["inner" + name] ||
                        
                        // Everyone else use document.documentElement or document.body depending on Quirks vs Standards mode
-                       jQuery.boxModel && document.documentElement["client" + name] || document.body["client" + name] :
+                       document.compatMode == "CSS1Compat" && document.documentElement["client" + name] || document.body["client" + name] :
                
                // Get document width or height
                        this[0] == document ?