The HTMLContentElement.select property reflects the select attribute. It is a DOMString containing a space-separated list of CSS selectors that select the content to insert in place of the <content> element.
object.select = "CSSselector CSSselector ...";
// Select <h1> elements and elements with class="error" myContentObject.select = "h1 .error";
| Specification | Status | Comment |
|---|---|---|
| Shadow DOM The definition of 'content' in that specification. | Working Draft |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 35 | 28 (28) [1] | Not supported | 26 | Not supported |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | 37 | 28.0 (28) [1] | Not supported | ? | ? |
[1] If Shadow DOM is not enabled in Firefox, <content> elements will behave like HTMLUnknownElement. Shadow DOM was first implemented in Firefox 28 and is behind a preference, dom.webcomponents.enabled, which is disabled by default.
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLContentElement/select