jQuery Browser support - from migration

jquery.browser.js

/* Jquery Browser */
jQuery.uaMatch = function( ua ) {
  ua = ua.toLowerCase();

  var match = /(chrome)[ \/]([\w.]+)/.exec( ua ) ||
    /(webkit)[ \/]([\w.]+)/.exec( ua ) ||
    /(opera)(?:.*version|)[ \/]([\w.]+)/.exec( ua ) ||
    /(msie) ([\w.]+)/.exec( ua ) ||
    ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec( ua ) ||
    [];

  return {
    browser: match[ 1 ] || "",
    version: match[ 2 ] || "0"
  };
};

// Don't clobber any existing jQuery.browser in case it's different
if ( !jQuery.browser ) {
  matched = jQuery.uaMatch( navigator.userAgent );
  browser = {};

  if ( matched.browser ) {
    browser[ matched.browser ] = true;
    browser.version = matched.version;
  }

  // Chrome is Webkit, but Webkit is also Safari.
  if ( browser.chrome ) {
    browser.webkit = true;
  } else if ( browser.webkit ) {
    browser.safari = true;
  }

  jQuery.browser = browser;
}