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800Part IIIDocument Objects ReferenceReload the page after you are finished to restore the original state. Related Items:addRule(), deleteRule(), insertRule(), removeRule()methods. disabledValue:Boolean.Read/WriteCompatibility:WinIE4+, MacIE4+, NN6+, Moz1+, Safari1+ While the disabledproperty of the styleelement object works with that element only, thestyleSheetobject s disabledproperty works with a styleSheetobject that comes intothe document by a linkelement as well. Enabling and disabling stylesheets is one way to swap different appearance styles for a page, allowing the user to select the preferred style. The page can contain multiple stylesheets thatcontrol the same selectors, but your script can enable one and disable another to change theoverall style. You can even perform this action via the onloadevent handler. For example, ifyou have separate stylesheets for Windows and Mac browsers, you can put both of them inthe document, initially both disabled. An onloadevent handler determines the operating sys- tem and enables the stylesheet tailored for that OS. Unless your stylesheets are very extensive, there is little download performance penalty for having both stylesheets in the document. ExampleUse The Evaluator (Chapter 13) to toggle between the enabled and disabled state of the firststyleSheetobject on the page. Enter the following statement into the top text box: document.styleSheets[0].disabled = (!document.styleSheets[0].disabled) The inclusion of the NOT operator (!) forces the state to change from trueto falseorfalseto truewith each click of the Evaluate button. Related Items:disabledproperty of the styleelement object. hrefValue:String.Read/Write (See Text) Compatibility:WinIE4+, MacIE4+, NN6+, Moz1+, Safari1+ When a stylesheet is linked into a document via a linkelement, the hrefproperty of thestyleSheetobject contains a string with the URL to that file. Essentially, the hrefpropertyof the linkelement is passed along to the styleSheetobject that loads as a result. In WinIE4+ only, this property is read/write, allowing you to dynamically link in an external stylesheet fileafter the page has loaded. In MacIE and NN6+/Moz, this property is read-only. Related Items:linkelement object. idValue:String.Read-OnlyCompatibility:WinIE4+, MacIE4+, NN-, Moz-, Safari- The idproperty of a styleSheetobject inherits the idproperty of its containing element(styleor linkelement). This can get confusing, because it may appear as though two objectsin the document have the same ID. The idstring, however, can be used as an index to thedocument.styleSheetsarray in IE4+ (for example, document.styleSheets[ winLINK ]). NN does not provide a comparable identifier associated with a styleSheetobject. Related Items:idproperty of all element objects. styleSheetObject.cssText
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