当我们不能使用字形字体时,如何使用列表的字体大小制作列表样式图像比例？

Question

当我们不能使用字形字体时,如何使用列表的字体大小制作列表样式图像比例？

dop*_*ner 35 html css html5 svg html-lists

我正在研究的网页在列表中使用了一些花哨的V形符号.我想定义一个列表样式,它可以根据列表项本身的字体大小进行扩展:这样做是我问题的最终目标.

我们目前将这些V形文件保存在SVG文件中(其中一个在下面提供),因此它们可以放大而不会看起来很糟糕.他们被引用如下:

ul.foo {
    list-style-image: url("../images/chevron.svg");
}

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我们在网站周围使用这些雪佛龙列表几次.有时他们使用大文本,有时文本较小或正常.我们不得不为每个字体大小(例如一个新的字形图像chevron-small.svg,chevron-medium.svg,chevron-large.svg,等),但肯定有一个更好的办法,让我们只使用了一个图像,并把它放大和缩小在自己的基础上的字体尺寸!

但是,我还没有想出如何使用字体大小来缩放图像.

列表样式图像的W3 wiki表明"如果图像的固有宽度或高度以百分比形式给出,则该百分比将根据1em来解决",这听起来就像我们想要的那样.我还没有弄清楚如何实现这一目标.布赖恩·坎贝尔的回答给我怎样才能让一个SVG的规模与其父容器？似乎提出了一种方法来使这个百分比发生,但是当我设置100%的宽度或高度时,即使字体很大,人字形的子弹点也会显得非常微小或根本没有.

如何使用文本大小完全实现此列表样式图像缩放,以便当UL的文本大小变大时,子弹图像也会如此？

(字形字体:我们不能使用它们.它们可以在视觉上完成工作,但是它们对可访问性产生了不良影响,因为屏幕阅读器不会将子弹读出为子弹,而是作为其他一些奇怪的字符.我们可以定义可能是自定义字形字体,并用它们替换它中的项目符号字符,但这样做的文件大小开销会过大.据我所知,我们需要使用图像.)

我的SVG代码

SVG来自Illustrator并具有以下代码:

<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 15.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
     width="8px" height="14px" viewBox="0 0 8 14" enable-background="new 0 0 8 14" xml:space="preserve">
<path fill="#666666" d="M0.37,12.638l5.726-5.565L0.531,1.347C0.252,1.059,0.261,0.601,0.547,0.321
    c0.289-0.279,0.746-0.272,1.026,0.016l6.062,6.24c0,0.002,0.006,0.004,0.008,0.006c0.068,0.07,0.119,0.156,0.156,0.244
    C7.902,7.088,7.846,7.399,7.631,7.61c-0.002,0.004-0.006,0.004-0.01,0.006l-6.238,6.063c-0.143,0.141-0.331,0.209-0.514,0.205
    c-0.187-0.006-0.372-0.078-0.511-0.221C0.076,13.376,0.083,12.919,0.37,12.638"/>
</svg>

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其中显示如下,其中文本是16px,并且V形符号没有缩放到字体大小,但是相当大且可见(在这种情况下比想象的要大一点,但是让我们忽略它,因为图像本身可以被编辑):

正如我所说,我试图遵循Brian Campbell的回答并将width或height属性设置为100%:

<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
     width="100%" viewBox="0 0 8 14" enable-background="new 0 0 8 14" xml:space="preserve">

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然而,宽度或高度定义为100%似乎使V形变小,并且比1em小得多,如上所述:

(来自Firefox的屏幕截图.在Chrome中它们有点大,但仍远小于16px.)

代码段

/* 
The image referenced here is the SVG provided above, with base 64 encoding. It is the
freshly exported version that still has a defined width and height of 8px and 14px.
You may wish to just save the SVG above locally.
*/

ul {
  list-style-image: url('data:image/svg+xml;base64,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');
  /* Or if you wish to save the SVG locally:
  list-style-image: url('chevron.svg');
  */
}

.small-list {
   font-size: 85%;
}

.large-list {
  font-size: 150%;
}

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<ul class="small-list">
  <li>The goal is to make the chevron smaller for this list</li>
  <li>Specifically, just slightly smaller than capital letters, as stated.</li>
  <li>Nomas matas</li>
  <li>Roris dedit</li>
</ul>

<ul class="large-list">
  <li>And larger for this list</li>
  <li>Nomas matas</li>
  <li>Roris dedit</li>
</ul>

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Answer 1

小智 28

我会在每个之前使用伪元素来解决这个问题 li

这是标记

ul {
    list-style: none;
}

li {
    position: relative;
}

li:before {
    /*
    The desired width gets defined in two places: The element width, and background size.
    The height only gets defined once, in background size.
    */
    position: absolute;
    display: block;
    content: '\2022'; /* bullet point, for screen readers */
    text-indent: -999999px; /* move the bullet point out of sight */
    left: -.75em;
    width: .4em; /* desired width of the image */
    height: 1em; /* unrelated to image height; this is so it gets snipped */
    background-repeat: no-repeat;
    background-image: url('data:image/svg+xml;base64,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');
    background-size: .4em .7em;
    background-position: 0 .3em;
}

.small-list {
    font-size: 85%;
}

.large-list {
    font-size: 150%;
}

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<ul class="small-list">
  <li>The goal is to make the chevron smaller for this list</li>
  <li>Specifically, just slightly smaller than capital letters, as stated.</li>
  <li>Nomas matas</li>
  <li>Roris dedit</li>
</ul>
    
<ul class="large-list">
  <li>And larger for this list</li>
  <li>Multiline list item<br>for testing</li>
  <li>Nomas matas</li>
  <li>Roris dedit</li>
</ul>

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说明:

首先我们摆脱了默认的子弹 ul
然后我们li使用:before选择器在每个前面创建一个伪元素content: '\2022';
- 在content: '\2022';增加了unicode的子弹点,•,屏幕阅读器读出.文本缩进使其远离视线.
然后,我们将背景(雪佛龙)应用于伪元素,并使用一些属性对其进行大小调整.这里的关键部分是确保尺寸保持与svg相同的比例.使用伪元素的尺寸定义,em以便在font-size更改时按比例调整.最后,我们还将背景定位在子弹所在的位置.
- background-size: .4em .7em; 告诉浏览器按照图像大小的方式调整背景大小,我们需要在这里保持正确的宽高比.
- background-position: 0 .3em; 将V形图像与文本一致移动.
- width: .4em;使psuedo元素足够宽以适合图像,并height: 1em;使其与行高匹配,并且足够高以适应偏移.

警告: - IE 8不支持background-size,但我认为这不会是一个问题,因为它也不支持渲染svg.

Answer 2

ton*_*ris 5

在SVG图像XML中,您必须删除width和height属性,然后SVG将缩放为100%或1emfont-size

以下是您的图像的base64版本:

list-style-image: url('data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz48IURPQ1RZUEUgc3ZnIFBVQkxJQyAiLS8vVzNDLy9EVEQgU1ZHIDEuMS8vRU4iICJodHRwOi8vd3d3LnczLm9yZy9HcmFwaGljcy9TVkcvMS4xL0RURC9zdmcxMS5kdGQiPjxzdmcgdmVyc2lvbj0iMS4xIiBpZD0iTGF5ZXJfMSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB4bWxuczp4bGluaz0iaHR0cDovL3d3dy53My5vcmcvMTk5OS94bGluayIgeD0iMHB4IiB5PSIwcHgiIHZpZXdCb3g9IjAgMCA4IDE0IiBlbmFibGUtYmFja2dyb3VuZD0ibmV3IDAgMCA4IDE0IiB4bWw6c3BhY2U9InByZXNlcnZlIj48cGF0aCBmaWxsPSIjNjY2NjY2IiBkPSJNMC4zNywxMi42MzhsNS43MjYtNS41NjVMMC41MzEsMS4zNDdDMC4yNTIsMS4wNTksMC4yNjEsMC42MDEsMC41NDcsMC4zMjFjMC4yODktMC4yNzksMC43NDYtMC4yNzIsMS4wMjYsMC4wMTZsNi4wNjIsNi4yNGMwLDAuMDAyLDAuMDA2LDAuMDA0LDAuMDA4LDAuMDA2YzAuMDY4LDAuMDcsMC4xMTksMC4xNTYsMC4xNTYsMC4yNDRDNy45MDIsNy4wODgsNy44NDYsNy4zOTksNy42MzEsNy42MWMtMC4wMDIsMC4wMDQtMC4wMDYsMC4wMDQtMC4wMSwwLjAwNmwtNi4yMzgsNi4wNjNjLTAuMTQzLDAuMTQxLTAuMzMxLDAuMjA5LTAuNTE0LDAuMjA1Yy0wLjE4Ny0wLjAwNi0wLjM3Mi0wLjA3OC0wLjUxMS0wLjIyMUMwLjA3NiwxMy4zNzYsMC4wODMsMTIuOTE5LDAuMzcsMTIuNjM4Ii8+PC9zdmc+');

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遗憾的是,您无法明确设置a的大小 list-style-image,但是有一个hack解决方案不需要任何进一步的HTML;

如果您的LI元素只包含一行文本(列表经常出现这种情况),那么您可以使用css选择器::first-line向上或向下缩放字体大小,而不会影响列表样式图像.

提供这种替代解决方案:

ul {
  list-style-image: url('data:image/svg+xml;base64,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');
}

.small-list {
  font-size: 140%;
}
.large-list {
  font-size: 350%;
}

.small-list li::first-line,
.large-list li::first-line{
 font-size: 70%;
}

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