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@media screen and (-webkit-min-device-pixel-ratio:0)  {
	.demo { 
    color: #f36; 
  }
}

xyqfer

/* 支持所有firefox版本 */
#selector[id=selector] { property: value; }

@-moz-document url-prefix() { 
  .selector { property: value; }
} 

/* 支持所有Gecko内核的浏览器 (包括Firefox) */
*>.selector { property: value; }

xyqfer

/*
    <div class="arrow-up"></div>
    <div class="arrow-down"></div>
    <div class="arrow-left"></div>
    <div class="arrow-right"></div>
*/

.arrow-up {
        width: 0;
        height: 0;

xyqfer

.inlineblock{
  display:inline-block;
  *display:inline;
  *zoom:1;
}

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<!--[if IE 6]>
    <script type="text/javascript">
        document.execCommand("BackgroundImageCache",false,true);
    </script>
<![endif]-->

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selector {
  min-height:500px;
  height:auto !important;
  height:500px;
}

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//直接操作需要的元素
var container = document.getElementById(elementId);
container.style.width = (container.clientWidth > (width - 1)) ? width + "px" : "auto";

//定义函数，多次调用
function setMaxWidth(elementId, width){
var container = document.getElementById(elementId);
container.style.width = (container.clientWidth > (width - 1)) ? width + "px" : "auto";
}
//调用函数

xyqfer

////直接操作需要的元素
var container = document.getElementById('container');
container.style.width = (container.clientWidth < width) ? "500px" : "auto";

//定义函数，多次调用
function setMinWidth(elementId, width){
var container = document.getElementById(elementId);
container.style.width = (container.clientWidth < width) ? width + "px" : "auto";
}
//调用函数

xyqfer

//直接操作需要的元素
var container = document.getElementById('container');
container.style.height = (container.scrollHeight > 199) ? "200px" : "auto";

//定义函数，多次调用
function setMaxHeight(elementId, height){
  var container = document.getElementById(elementId);
	container.style.height = (container.scrollHeight > (height - 1)) ? height + "px" : "auto";
}
//调用函数

xyqfer

var ev = {
    addHandler : function(e, ev, fn){
  	e.addEventListener ? e.addEventListener(ev, fn, false) : (e["_"+ev+fn] = fn, e[ev+fn] = function(){ e["_"+ev+fn]() }, e.attachEvent("on"+ev, e[ev+fn]));
	},

    removeHandler : function(e, ev, fn){
		e.removeEventListener ? e.removeEventListener(ev, fn, false) : e.detachEvent(ev,e[ev+fn]);
	},

    addLoadHandler : function(fn){