是否有一种方法可以将SVG用作伪元素::before或::after中的内容

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最佳答案

是的，你可以!刚刚测试了这个，它工作得很好，这是了不起的!

#test::before {
content: url(path/to/your.svg);
width: 200px;
height: 200px;
}

或者如果你喜欢把SVG直接放在CSS中:

#test::before {
content: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='100' cy='50' r='40' stroke='black' stroke-width='2' fill='red'/%3E%3Cpolyline points='20,20 40,25 60,40 80,120 120,140 200,180' style='fill:none;stroke:black;stroke-width:3'/%3E%3C/svg%3E ");
width: 200px;
height: 200px;
}

<div id="test"></div>

SVG URL encoder to format your own SVGs as shown here.

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您可以将SVG添加为空:after或:before的background-image。

给你:

.anchor:before {
display: block;
content: ' ';
background-image: url('../images/anchor.svg');
background-size: 28px 28px;
height: 28px;
width: 28px;
}

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使用CSS sprites和data uri提供了额外的有趣的好处，如快速加载和更少的请求，我们通过使用image/base64获得IE8支持:

< a href = " http://codepen。 . io/anon/pen/RNNEaB">使用SVG的代码依赖示例

超文本标记语言

<div class="div1"></div>
<div class="div2"></div>

CSS

.div1:after, .div2:after {
content: '';
display: block;
height: 80px;
width: 80px;
background-image: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20version%3D%221.1%22%20height%3D%2280%22%20width%3D%22160%22%3E%0D%0A%20%20%3Ccircle%20cx%3D%2240%22%20cy%3D%2240%22%20r%3D%2238%22%20stroke%3D%22black%22%20stroke-width%3D%221%22%20fill%3D%22red%22%20%2F%3E%0D%0A%20%20%3Ccircle%20cx%3D%22120%22%20cy%3D%2240%22%20r%3D%2238%22%20stroke%3D%22black%22%20stroke-width%3D%221%22%20fill%3D%22blue%22%20%2F%3E%0D%0A%3C%2Fsvg%3E);
}
.div2:after {
background-position: -80px 0;
}

对于IE8，更改如下:

  background-image: url(data:image/png;base64,data......);

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你可以使用url() CSS函数。

#mydiv::before {
content: url("data:image/svg+xml; utf8, <svg ... code here</svg>");
display: block;
width: 22px;
height: 10px;
margin: 10px 5px 0 10px;
}

确保您的SVG不包含任何#符号。使用像这一个这样的编码器。

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小心其他答案在IE中都有问题。

让我们有这种情况-按钮与前置图标。所有浏览器都能正确地处理这一点，但IE采用元素的宽度并缩放之前的内容以适应它。JSFiddle

#mydiv1 { width: 200px; height: 30px; background: green; }
#mydiv1:before {
content: url("data:url or /standard/url.svg");
}

解决方案是将size设置为element之前，并将其留在原来的位置:

#mydiv2 { width: 200px; height: 30px; background: green; }
#mydiv2:before {
content: url("data:url or /standard/url.svg");
display: inline-block;
width: 16px; //only one size is alright, IE scales uniformly to fit it
}

background-image + background-size解决方案也可以，但有点不方便，因为你必须指定相同的大小两次。

IE11的结果是:

IE渲染

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<div class="author_">Lord Byron</div>

.author_ {  font-family: 'Playfair Display', serif; font-size: 1.25em; font-weight: 700;letter-spacing: 0.25em; font-style: italic;
position:relative;
margin-top: -0.5em;
color: black;
z-index:1;
overflow:hidden;
text-align:center;
 

}




.author_:after{
left:20px;
margin:0 -100% 0 0;
display: inline-block;
height: 10px;
content: url(data:image/svg+xml,%0A%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22120px%22%20height%3D%2220px%22%20viewBox%3D%220%200%201200%20200%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%3E%0A%20%20%3Cpath%20stroke%3D%22black%22%20stroke-width%3D%223%22%20fill%3D%22none%22%20d%3D%22M1145%2085c17%2C7%208%2C24%20-4%2C29%20-12%2C4%20-40%2C6%20-48%2C-8%20-9%2C-15%209%2C-34%2026%2C-42%2017%2C-7%2045%2C-6%2062%2C2%2017%2C9%2019%2C18%2020%2C27%201%2C9%200%2C29%20-27%2C52%20-28%2C23%20-52%2C34%20-102%2C33%20-49%2C0%20-130%2C-31%20-185%2C-50%20-56%2C-18%20-74%2C-21%20-96%2C-23%20-22%2C-2%20-29%2C-2%20-56%2C7%20-27%2C8%20-44%2C17%20-44%2C17%20-13%2C5%20-15%2C7%20-40%2C16%20-25%2C9%20-69%2C14%20-120%2C11%20-51%2C-3%20-126%2C-23%20-181%2C-32%20-54%2C-9%20-105%2C-20%20-148%2C-23%20-42%2C-3%20-71%2C1%20-104%2C5%20-34%2C5%20-65%2C15%20-98%2C22%22%2F%3E%0A%3C%2Fsvg%3E%0A);
}
.author_:before {
right:20px;
margin:0 0 0 -100%;
display: inline-block;
height: 10px;
content: url(data:image/svg+xml,%0A%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22120px%22%20height%3D%2220px%22%20viewBox%3D%220%200%201200%20130%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%3E%0A%20%20%3Cpath%20stroke%3D%22black%22%20stroke-width%3D%223%22%20fill%3D%22none%22%20d%3D%22M55%2068c-17%2C6%20-8%2C23%204%2C28%2012%2C5%2040%2C7%2048%2C-8%209%2C-15%20-9%2C-34%20-26%2C-41%20-17%2C-8%20-45%2C-7%20-62%2C2%20-18%2C8%20-19%2C18%20-20%2C27%20-1%2C9%200%2C29%2027%2C52%2028%2C23%2052%2C33%20102%2C33%2049%2C-1%20130%2C-31%20185%2C-50%2056%2C-19%2074%2C-21%2096%2C-23%2022%2C-2%2029%2C-2%2056%2C6%2027%2C8%2043%2C17%2043%2C17%2014%2C6%2016%2C7%2041%2C16%2025%2C9%2069%2C15%20120%2C11%2051%2C-3%20126%2C-22%20181%2C-32%2054%2C-9%20105%2C-20%20148%2C-23%2042%2C-3%2071%2C1%20104%2C6%2034%2C4%2065%2C14%2098%2C22%22%2F%3E%0A%3C%2Fsvg%3E%0A);
}

	<div class="author_">Lord Byron</div>

Convenient tool for SVG encoding url-encoder

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.myDiv {
display: flex;
align-items: center;
}


.myDiv:before {
display: inline-block;
content: url(./dog.svg);
margin-right: 15px;
width: 10px;
}

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为了进一步扩展这个主题。如果你想添加字体棒极了图标，你需要添加一些额外的CSS。

图标默认有类svg-inline--fa和fa-w-*。

还有诸如fa-lg、fa-rotate-*等修饰符类。你需要检查svg-with-js.css文件并为其找到合适的CSS。

你需要为css图标添加自己的颜色，否则它将默认为黑色，例如fill='%23f00'，其中%23编码为#。

h1::before{


/* svg-inline--fa */
display:inline-block;
font-size:inherit;
height:1em;
overflow:visible;
vertical-align:-.125em;
  

/* fa-w-14 */
width:.875em;
  

/* Icon */
content:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 448 512'%3E%3Cpath fill='%23f00' d='M400 256H152V152.9c0-39.6 31.7-72.5 71.3-72.9 40-.4 72.7 32.1 72.7 72v16c0 13.3 10.7 24 24 24h32c13.3 0 24-10.7 24-24v-16C376 68 307.5-.3 223.5 0 139.5.3 72 69.5 72 153.5V256H48c-26.5 0-48 21.5-48 48v160c0 26.5 21.5 48 48 48h352c26.5 0 48-21.5 48-48V304c0-26.5-21.5-48-48-48zM264 408c0 22.1-17.9 40-40 40s-40-17.9-40-40v-48c0-22.1 17.9-40 40-40s40 17.9 40 40v48z'%3E%3C/path%3E%3C/svg%3E");
  

/* Margin */
margin-right:.75rem;
}

<h1>Lorem Ipsum</h1>

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我今天刚刚注意到，这里的一家报纸使用SVG直接注入到::before和::after伪元素中，为文章中突出显示的内容呈现程式化的引用。我试图通过whatcms.org找到论文的CMS，但无济于事。然而，我可以说，所有者报纸-一个大型的国家，甚至国际，报纸使用CMS称为DM Polopoly。

在内容元素中输入SVG数据似乎比空白内容并使用SVG作为背景图像要费力得多。我想知道他们为什么选择这种方法——这种方法有什么好处。我在谷歌链接上看到一些人说，在伪元素上悬停时操纵SVG图像很容易…但我没有看到这种“好处”的绝佳例子。

这篇文章有一个更简单的方法来插入SVG作为内容。它使用缩放属性来调整图像的大小

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虽然这是很多年前的事了，但我还是想分享一下。

以上答案是正确的，您可以直接将编码后的svg字符串附加到css content属性中。对于那些与URL有任何问题的人来说，可能是由于空格和字符无效，在这种情况下，将您解码的SVG代码粘贴到: https://mothereff.in/url < / p >

使用编码的SVG URL，它应该工作正常。不正确的,正确的例子:< / p >

#incorrect::before {
content: url(
data:image/svg + xml,
<svgid="Layer_1"data-name="Layer 1"xmlns="http://www.w3.org/2000/svg"viewBox="0 0 15.37 188.41"><defs><style>.cls-1{fill:#aeadad;}</style></defs><circleclass="cls-1"cx="7.69"cy="7.69"r="7.69"/><rectclass="cls-1"x="6.69"y="27.72"width="2"height="160.69"/></svg>
);
}

#correct::before {
content: url(data:image/svg+xml,%0A%3Csvg%20id%3D%22Layer%5f1%22%20data-name%3D%22Layer%201%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%2015.37%20188.41%22%3E%3Cdefs%3E%3Cstyle%3E.cls-1%7Bfill%3A%23aeadad%3B%7D%3C%2Fstyle%3E%3C%2Fdefs%3E%3Ccircle%20class%3D%22cls-1%22%20cx%3D%227.69%22%20cy%3D%227.69%22%20r%3D%227.69%22%2F%3E%3Crect%20class%3D%22cls-1%22%20x%3D%226.69%22%20y%3D%2227.72%22%20width%3D%222%22%20height%3D%22160.69%22%2F%3E%3C%2Fsvg%3E%0A);
}

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使用一个空内容的背景蒙版图像，你可以在css中控制颜色:(不要忘记你喜欢的位置，宽度和高度)…!

background-color: red;
-webkit-mask-image: url(icon.svg);
mask-image: url(icon.svg);
content:'';