我认为答案是否定的，但是你可以用CSS定位一个背景图像，这样它就离右边有一个固定数量的像素?
如果我设置x和y的背景位置值，似乎它们只分别从左边和上面给出固定的像素调整。
当前回答
对大家都好
background: url('../images/bg-menu-dropdown-top.png') left 20px top no-repeat !important;
其他回答
您可以在编辑器中将背景图像定位为距离右侧x像素。
background: url(images_url) no-repeat right top;
背景图像将位于右上方，但将显示为距离右侧x个像素。
据我所知，CSS规范并没有提供您所要求的内容，当然，除了CSS表达式之外。除去你不想使用表达式或Javascript的假设，我看到了三个hack的解决方案:
Make sure your background image matches the size of the container (at least in width) and set background-repeat: repeat or repeat-x if only the width is equalized. Then, having something appear x pixels from the right is as simple as background-position: -5px 0px. Using percentages for background-position exhibits special behaviour that is better seen than described here. Give it a shot. Essentially, background-position: 90% 50% will make the right edge of the background image line up 10% away from the right edge of the container. Create a div containing the image. Explicitly set the position of the containing element position: relative if not already set. Set the image container to position: absolute; right: 10px; top: 10px;, obviously adjusting the final two as you see fit. Place the image div container into the containing element.
可以使用属性边框作为从右边开始的长度
background: url('/img.png') no-repeat right center;
border-right: 10px solid transparent;
对大家都好
background: url('../images/bg-menu-dropdown-top.png') left 20px top no-repeat !important;
你可以在CSS3中这样做:
background-position: right 20px bottom 20px;
它适用于Firefox, Chrome, IE9+
来源:中数
