HTML and DOM API changes list (HTML)

[ This article is for Windows 8.x and Windows Phone 8.x developers writing Windows Runtime apps. If you’re developing for Windows 10, see the latest documentation ]

Windows Runtime apps using JavaScript use Windows Internet Explorer Standards mode when processing most of their HTML and JavaScript, but there are some HTML and DOM APIs that work differently or aren't supported. Here's the list of the HTML and DOM APIs that behave differently or aren't supported for Windows Runtime apps using JavaScript.

When writing code for web sites and Windows apps using JavaScript, you can use feature detection to determine whether an API is supported before you use it. For more info, see Same Markup: Writing Cross-Browser Code.

API	Description
a.target	Behavior change. Cannot be used to open a new window inside the app. If you try to open an external web page in a new window (such as by setting target = "_blank") the link opens in the browser instead.
a.uri	Not supported.
addBehavior	Not supported.
body.behaviorUrns	Not supported.
body.removeBehavior	Not supported.
body.scopeName	Not supported.
body.tagUrn	Not supported.
document.execCommand	Behavior change. The createLink and insertImage commands don't create a UI. The saveAs and open commands are not supported.
document.queryCommandEnabled	Behavior change. The createLink and insertImage commands don't create a UI. The saveAs and open commands are not supported.
document.queryCommandIndeterm	Behavior change. The createLink and insertImage commands don't create a UI. The saveAs and open commands are not supported.
document.queryCommandState	Behavior change. The createLink and insertImage commands don't create a UI. The saveAs and open commands are not supported.
document.queryCommandSupported	Behavior change. The createLink and insertImage commands don't create a UI. The saveAs and open commands are not supported.
document.queryCommandValue	Behavior change. The createLink and insertImage commands don't create a UI. The saveAs and open commands are not supported.
document.write	Behavior change. Content is filtered as through it was processed by the toStaticHTML method. Trying to inject HTML that contains an unknown element, event handlers, script or references to script, or unknown CSS pseudo-elements and pseudo-classes causes an exception when you add the HTML to the page's DOM. For more info, see Making HTML safer: details for toStaticHTML.
document.writeln	Behavior change. Content is filtered as through it was processed by the toStaticHTML method. Trying to inject HTML that contains an unknown element, event handlers, script or references to script, or unknown CSS pseudo-elements and pseudo-classes causes an exception when you add the HTML to the page's DOM. For more info, see Making HTML safer: details for toStaticHTML.
DOMParser.parseFromString	Behavior change. Content is filtered as through it was processed by the toStaticHTML method. Trying to inject HTML that contains an unknown element, event handlers, script or references to script, or unknown CSS pseudo-elements and pseudo-classes causes an exception when you add the HTML to the page's DOM. For more info, see Making HTML safer: details for toStaticHTML.
innerHTML	Behavior change. Content is filtered as through it was processed by the toStaticHTML method. Trying to inject HTML that contains an unknown element, event handlers, script or references to script, or unknown CSS pseudo-elements and pseudo-classes causes an exception when you add the HTML to the page's DOM. For more info, see Making HTML safer: details for toStaticHTML.
insertAdjacentHTML	Behavior change. Content is filtered as through it was processed by the toStaticHTML method. Trying to inject HTML that contains an unknown element, event handlers, script or references to script, or unknown CSS pseudo-elements and pseudo-classes causes an exception when you add the HTML to the page's DOM. For more info, see Making HTML safer: details for toStaticHTML.
navigator.appCodeName	Not supported.
navigator.mimeTypes	Not supported.
navigator.plugins	Not supported.
onbeforeunload	Behavior change. If your onbeforeunload event handler returns false, null, undefined, or nothing, the app calls the onunload event handler. If the onbeforeunload event handler returns a string from and the app is running, the app displays a Flyout containing the string returned as a prompt with Continue and Cancel buttons. Continue proceeds with the navigation, Cancel terminates the navigation. If the onbeforeunload event handler returns true and the app is running, the app doesn't display any prompt to the user at all and cancels the navigation. onunload is not called. If the onbeforeunload event handler returns anything and the app is not running, the app ignores the return value and proceeds to call the onunload event handler.
outerHTML	Behavior change. Content is filtered as through it was processed by the toStaticHTML method. Trying to inject HTML that contains an unknown element, event handlers, script or references to script, or unknown CSS pseudo-elements and pseudo-classes causes an exception when you add the HTML to the page's DOM. For more info, see Making HTML safer: details for toStaticHTML.
pasteHTML	Behavior change. Content is filtered as through it was processed by the toStaticHTML method. Trying to inject HTML that contains an unknown element, event handlers, script or references to script, or unknown CSS pseudo-elements and pseudo-classes causes an exception when you add the HTML to the page's DOM. For more info, see Making HTML safer: details for toStaticHTML.
removeBehavior	Not supported.
responseXML	Behavior change. For Windows Runtime apps using JavaScript, this property returns the web-standards based DOMParser object instead of the ActiveX-based object.
title	Behavior change. The title element doesn't render.
window.alert	Not supported. (This method works when your app is in development mode, though, so that you can use it to debug.)
window.close	Terminates the app. You can call it only from local context pages.
window.confirm	Not supported.
window.dialogArguments	Not supported.
window.dialogHeight	Not supported.
window.dialogLeft	Not supported.
window.dialogTop	Not supported.
window.dialogWidth	Not supported.
window.execScript	Behavior change. This method can be used to execute only JavaScript. It can't be used to execute VBScript.
window.external	Not supported.
window.menuArguments	Not supported.
window.moveBy	Not supported.
window.moveTo	Not supported.
window.onhelp	Not supported.
window.open	Not supported.
window.prompt	Not supported.
window.resizeBy	Not supported.
window.resizeTo	Not supported.
window.returnValue	Not supported.
window.sessionStorage	This property appears to work, but data is lost when the app is terminated. Do not use this property to store app state.
window.showHelp	Not supported.
window.showModalDialog	Not supported.
window.showModelessDialog	Not supported.
xhr.responseBody	Not supported.