Better browser type and version detection

[hobbit]

Better browser detection script (not finished).

new function(){
  var
  //When the script run, the html element already exists.
  html=document.getElementsByTagName("html")[0],
  b=navigator.userAgent.toLowerCase(),
  version=
    b.match(/opera.(d+.d+)/) ||
    b.match(/; rv:(d+.d+.d+)/) ||
    b.match(/applewebkit.(d+(.d+)?)/) ||
    b.match(/msie (d.d+)/);

  $.browser.msie      = html.style.filter !== undefined;
  //MozBoxAlign attrib supported since Gecko 1.0.x.
  $.browser.mozilla   = html.style.MozBoxAlign !== undefined;
  //opPhonemes attrib supported since Opera 8.0.
  $.browser.opera     = html.style.opPhonemes !== undefined;
  //$.browser.safari  = ???;
  $.browser.version   = (version.length && version[1]) || null;

  $.boxModel = !$.browser.msie || document.compatMode == "CSS1Compat";

  //I don't know this expression works on Macintosh.
  //$.browser.msie = /*@cc_on true || @*/ false;
}

[john]

This should be mentioned as a follow-up to ticket #1101. It's important to note that doing browser detection (instead of feature detection) is exactly what's needed here. Detecting an obscure browser feature can have future, unintended, consequences.

[hobbit]

Replying to john:

And if the user agent string is modified, the jQuery not works correctly. Example the conditional compilation works only in Internet Explorer since version 5.0. This detection is trusty: /*@cc_on true

@*/ false;