在Firefox中的SVG背景

Question

在我朋友的网站上工作,我无法弄清楚如何在Firefox中显示SVG.在Edge中,当我调整浏览器大小时,它也会消失.

http://lene.isreborn.com/

CSS - (我必须使用重要因为它是Wordpress):

header::after {
    content:"";
    display: block;
    background: url(/svg-filer/header-background.svg);
    background-size: contain;
    background-repeat: no-repeat;
    top: 0;
    left:-1%;
    width: 102% !important;
    height: 90px !important;
    position: absolute;
    z-index: -1;

    -ms-transition: top ease .5s;
    -moz-transition: top ease .5s;
    -webkit-transition: top ease .5s;
    transition: top ease .5s;
}

header.sticky-active::after { 
    top: -20px;
}

SVG文件:

  <?xml version="1.0" encoding="utf-8"?>
    <!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
    <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
         width="100%" height="90px" viewBox="0 0 1920 90" preserveAspectRatio="none">    
    <polygon id="XMLID_3_" fill="#FFFF00" points="1,99.7 1399.2,130 1921,99.7 1921,0 1,0 "/>
    </svg>

Answer 1

我现在已经明白了：背景大小不适用于“包含”，但适用于 100% 100%，请参阅 Mozilla 背景规则
链接到开发人员网站：请参阅此处

header::after {
    content:"";
    display: block;
    background: url(/svg-filer/header-background.svg);
    background-size: 100% 100% !important;
    background-repeat: no-repeat;
    top: 0;
    left:-1%;
    width: 102% !important;
    height: 90px !important;
    position: absolute;
    z-index: -1;

    -ms-transition: top ease .5s;
    -moz-transition: top ease .5s;
    -webkit-transition: top ease .5s;
    transition: top ease .5s;
}

header.sticky-active::after { 
    top: -20px;
}

Answer 2

图像实际上是白色的，对吗？如果将填充颜色更改为#000，您将看到一个图像：

<polygon id="XMLID_3_" fill="#000" points="1,99.7 1399.2,130 1921,99.7 1921,0 1,0 "/>

https://jsfiddle.net/fbwsh1pf/