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I read in mozilla doc, Element.createShadowRoot() is deprecated:
This method has been deprecated in favor of attachShadow.
But in my canary: chrome 49.0.2599.0
thats work:
var shadow = document.getElementById("node-sh").createShadowRoot();
And thats not work
var shadow = document.getElementById("node-sh").attachShadow({mode: 'closed'});
Anyone know what's right?
521
attachShadow() method attaches a shadow DOM tree to the specified element and returns a reference to its ShadowRoot .
Shadow DOM allows hidden DOM trees to be attached to elements in the regular DOM tree — this shadow DOM tree starts with a shadow root, underneath which you can attach any element, in the same way as the normal DOM.
Shadow DOM is a standard that encapsulates the internal document object model (DOM) structure of a web component. Encapsulating the DOM gives developers the ability to share a component and protect the component from being manipulated by arbitrary HTML, CSS, and JavaScript.
In Chrome: Press F12, DevTool will open. Click gear icon in DevTool. Uncheck "show user agent shadow DOM" checkbox.
createShadowRoot() is the old way of attaching a shadow-root to host element. It was proposed in initial spec, which has then been deprecated in favor of
attachShadow.
Spec also has been updated.
But, new API hasn't been standardized and none of the browsers currently support it. So I would suggest to stick to createShadowRootfor now. Once you start getting browser warnings for deprecation, that would be the time to move to attachShadow.
100
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