检查是否支持html元素

Question

如何检查是否支持html元素，例如datalist？ MDC表示它仅在Opera和FireFox中被推销。

Answer 1

if ('options' in document.createElement('datalist')) {
    // supported!
}

http://diveintohtml5.info/everything.html#datalist

Answer 2

如果有人需要检查其他HTML5元素的支持，也可以使用它。

https://github.com/ryanmorr/is-element-supported

来自http://ryanmorr.com/determine-html5-element-support-in-javascript/

/*
 * isElementSupported
 * Feature test HTML element support 
 * @param {String} tag
 * @return {Boolean|Undefined}
 */

(function(win){
    'use strict';       

    var toString = {}.toString;

    win.isElementSupported = function isElementSupported(tag) {
        // Return undefined if `HTMLUnknownElement` interface
        // doesn't exist
        if (!win.HTMLUnknownElement) {
            return undefined;
        }
        // Create a test element for the tag
        var element = document.createElement(tag);
        // Check for support of custom elements registered via
        // `document.registerElement`
        if (tag.indexOf('-') > -1) {
            // Registered elements have their own constructor, while unregistered
            // ones use the `HTMLElement` or `HTMLUnknownElement` (if invalid name)
            // constructor (http://stackoverflow.com/a/28210364/1070244)
            return (
                element.constructor !== window.HTMLUnknownElement &&
                element.constructor !== window.HTMLElement
            );
        }
        // Obtain the element's internal [[Class]] property, if it doesn't 
        // match the `HTMLUnknownElement` interface than it must be supported
        return toString.call(element) !== '[object HTMLUnknownElement]';
    };

})(this);