打印或转换为PDF时不会显示CSS边框
[英]CSS border won't display when printing or converting to PDF
问题描述
I would like to print this HTML table with the elements displayed with rounded borders, but as soon as I print the page the CSS class seems not to be displayed anymore. 
我想打印此HTML表，并以圆角边框显示元素，但是一旦我打印页面，CSS类似乎就不再显示。 Can anyone help? 有人可以帮忙吗？
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
.hashtag {
display: inline-block;
color: white;
font-size: 20px;
background-color: rgba(46, 200, 40, 0.5);
margin-left: 1px;
margin-right: 1px;
margin-top: 1px;
margin-bottom: 1px;
padding: 0.0em 0.5em;
border-radius: 1em;
text-indent: 0;
text-align: center;
}
</style>
</head>
<body>
<tr>
<td>
<p class="hashtag" align="center">CSS</p>
<p class="hashtag" align="center">WON'T</p>
<p class="hashtag" align="center">PRINT</p>
</td>
</tr>
</body>
</html>
2 个解决方案
解决方案1
4 2017-12-21 12:34:29
You are using white text on a dark background. 您在深色背景上使用白色文本。 But most browsers don't print background images or background colors by default, which will result in white text on no/white background in your case, ie it will remain invisible. 但是默认情况下，大多数浏览器都不打印背景图像或背景色，在您的情况下，这将导致白色文本显示为无/白色背景，即它将保持不可见。
It is possible to print background colors, but that's a browser preference/setting that can only be set/changed by the user, not via CSS or any other code in the website. 它可以打印背景颜色，但是这是一个浏览器偏好/设置，只能设置/更改用户，而不是通过CSS或网站的任何其他代码。
解决方案2
4 已采纳 2017-12-21 12:51:31
You are trying to print white text on a colored background, but most browsers will not print backgrounds by default (or if they do, then it is because the user has changed a setting to enable it). 您正在尝试在彩色背景上打印白色文本，但是大多数浏览器默认不会打印背景（或者，如果这样做，则是因为用户已更改设置以启用背景）。
You can prepare for this using a @media print { ... } addition to your stylesheet, which changes the applied style so it will print more nicely. 您可以使用样式表中的@media print { ... }来为此做准备，该样式表会更改应用的样式，以便更好地打印。 For an example see the snippet below: 有关示例，请参见下面的代码段：
.hashtag { display: inline-block; color: white; font-size: 20px; background-color: rgba(46, 200, 40, 0.5); margin-left: 1px; margin-right: 1px; margin-top: 1px; margin-bottom: 1px; padding: 0.0em 0.5em; border-radius: 1em; text-indent: 0; text-align: center; } @media print { .hashtag { color: black; background-color: white; border: 1px solid black; } #btnPrint { display: none } }
<p class="hashtag" align="center">CSS</p> <p class="hashtag" align="center">WILL</p> <p class="hashtag" align="center">PRINT (B/W)</p> <button id="btnPrint" onclick="window.print()">Print</button>
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