Select Element By CSS style (all with given style)

Question

Is there a way to select all elements that have a given style using JavaScript?

Eg, I want all absolutely positioned elements on a page.

I would assume it is easier to find elements by style where the style is explicitly declared:

• the style is non-inherited (such as positioning)
• the style is not the default (as would be position:static).

Am I limited to those rules? Is there a better method for when those rules apply?

I would happily to use a selector engine if this is provided by one (ideally Slick - Mootools 1.3)

EDIT:
I came up with a solution that will only work with above rules.
It works by cycling through every style rule, and then selector on page.
Could anyone tell me if this is better that cycling through all elements (as recommended in all solutions).
I am aware that in IE I must change the style to lowercase, but that I could parse all styles at once using cssText. Left that out for simplicity.
Looking for best practice.

var classes = '';
Array.each(documents.stylesheets, function(sheet){
   Array.each(sheet.rules || sheet.cssRules, function(rule){
      if (rule.style.position == 'fixed') classes += rule.selectorText + ',';
   });
});
var styleEls = $$(classes).combine($$('[style*=fixed]'));

Answer 1

You can keep Mootools, or whatever you use... :)

function getStyle(el, prop) {
  var view = document.defaultView;
  if (view && view.getComputedStyle) {
    return view.getComputedStyle(el, null)[prop];
  }
  return el.currentStyle[prop];
}

​function getElementByStyle(style, value, tag)​ {
  var all = document.getElementsByTagName(tag || "*");
  var len = all.length;
  var result = [];
  for ( var i = 0; i < len; i++ ) {
    if ( getStyle(all[i], style) === value )
      result.push(all[i]);
  }
  return result;
}

Answer 2

For Mootools:

var styleEls = $$('*').filter(function(item) {
    return item.getStyle('position') == 'absolute';
});

Answer 3

In jQuery you could use

$('*').filter( function(){
  return ($(this).css('position') == 'absolute');
} );

[update]

Or even create a new selector.
got me interested and so here is one (its my 1st, so its not built for efficiency) to find elements by css property..

$.expr[':'].css = function(obj, index, meta, stack){
  var params = meta[3].split(',');

  return ($(obj).css(params[0]) == params[1]);
};

usage: $('optionalSelector:css(property,value)')
will return all elements (of optionalSelector) whose property = value

example: var visibleDivs = $('div:css(visibility,visible)');
will return all divs whose visibility is set to visible (works for the default visibility as well..)