Function prefix

01.GettingStarted/js/vue.js:5324–5348

* Auto detect the appropriate prefix for a CSS property. * https://gist.github.com/paulirish/523692 * * @param {String} prop * @return {String}

(prop)

   */

  function prefix(prop) {
    prop = hyphenate(prop);
    var camel = camelize(prop);
    var upper = camel.charAt(0).toUpperCase() + camel.slice(1);
    if (!testEl) {
      testEl = document.createElement('div');
    }
    var i = prefixes.length;
    var prefixed;
    if (camel !== 'filter' && camel in testEl.style) {
      return {
        kebab: prop,
        camel: camel
      };
    }
    while (i--) {
      prefixed = camelPrefixes[i] + upper;
      if (prefixed in testEl.style) {
        return {
          kebab: prefixes[i] + prop,
          camel: prefixed
        };
      }
    }
  }

  // xlink
  var xlinkNS = 'http://www.w3.org/1999/xlink';