css - 为什么 -webkit-box-flex 属性对此不起作用？

Question

我正在制作一个网站，我制作了一些按钮并向它们添加了 -webkit-box-flex 属性。它运作良好。但是，当我向其中一个按钮添加下拉菜单时，-webkit-box-flex 属性不再适用于它们并且不起作用。谁能告诉我发生了什么事？

这是一个 jsfiddle:

http://jsfiddle.net/hGT6E/

*{
margin: 0px;
padding: 0px;
 }

h1{
font: bold 20px PrimaSans BT;
 }

 h2{
font: italic 14px PrimaSans BT;
  }

header, section, footer, aside, nav, article, hgroup, ul, li{
 display: block;
 }

 #wrapper{
max-width: 1000px;
margin: 20px 0px;
display: -webkit-box;
display: -moz-box;
-webkit-box-orient: vertical;
-moz-box-orient: vertical;

-webkit-box-flex: 1;
-moz-box-flex: 1;
margin-left: auto ;
margin-right: auto ;
}

#searchbox{
float: right;
margin-bottom: 10px;
}

body{
width: 100%;
margin: 0;
display:-moz-box;
-moz-box-pack: center;
display:-webkit-box;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0,    `enter code here`#ffffff), color-stop(1, #bababa));
background-image: -moz-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
background-repeat: no-repeat;
background-attachment: fixed;
  }

 #navigation{
display: block;
padding: 10px;
margin: 5px;
margin-bottom: 0px;
-webkit-border-radius: 15px;
width: 800px;
height: 60px;
display: -webkit-box;
-webkit-box-orient: horizontal;
display: -moz-box;
-moz-box-orient: horizontal;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
background-image: -moz-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));

 }

 #navigation li:hover ul{
display: block;
 }

 #navigation ul{
margin: 0px;
padding: 0px;
 }

 #navigation li{
position: relative;
float: left;
list-style-type: none;
 }

 #navigation ul:after{
display: block;
clear: both;
visibility: hidden;
 }

  #navigation li a{
text-decoration: none;
display: block;
color: black;
border-right: 1px solid grey;
padding: 10px 25px;

 }

  #navigation ul ul{
position: absolute;
border: 20px;
left: 0px;
width: 125px;
display: none;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
  }

  #navigation ul ul li{
border: 1px solid grey;
width: 99%;
-webkit-transition: background 2s
  }

   #navigation ul ul li:hover{
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#fffc01), color-stop(1, #ffde00));
  }

 #navigation ul ul li a{
border-right: none;
  }

  .navigation_button{
font: bold 18px PrimaSans BT;
-webkit-box-flex: 1;
width: 100px;
padding: 10px;
margin: 10px;
text-align: center;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
background-image: -moz-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
-webkit-border-radius: 10px;
-webkit-transition: -webkit-transform 2s, opacity 2s, background 2s, scale 2s,
  }

   .navigation_button:hover{
-webkit-transform: scale(1.05);
opacity: 1;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#fffc01), color-stop(1, #ffde00));
background-image: -moz-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#fffc01), color-stop(1, #ffde00));
 }

 #main_section{
border: 1px solid grey;
width: 750px;
margin-left: 40px;
margin-right: 30px;
border-top: 0px;
height: 800px;
margin-bottom: 10px;
-webkit-border-bottom-right-radius: 10px;
-webkit-border-bottom-left-radius: 10px;
background-color: #f1f1f1;
-webkit-box-flex: 1;
 }

 .article_1{
border: 1px solid gray;
background: white;
-webkit-box-flex: 1;
margin-left: 10px;
margin-right: 10px;
margin-top: 10px;
padding: 10px;
  }

  .article_1_footer{
text-align: right;
  }

  #footer{
text-align: center;
font: italic 12px Times New Roman
  }

谢谢!

Answer 1

box-flex 属性(现代名称:flex)仅适用于 flex 元素。为了成为 flex 元素，它的父元素必须是一个 flex 容器(显示值为box/flexbox/flex)。 .navigation_button 元素的父元素是 ul#nav_menu，它的显示类型是 block 。

http://jsfiddle.net/hGT6E/1/

#nav_menu {
    display: -webkit-box;
    width: 100%;
}

我必须警告不要依赖这些可用的属性。它们来自 2009 年的 Flexbox 规范，可能会在不久的将来被删除。如果您需要它们支持旧的移动浏览器，请确保您还为每个属性提供现代版本。