testing/web-platform/tests/css/css-backgrounds/border-image-width-should-extend-to-padding.html


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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Tyler Wilcock" href="mailto:twilco.o@protonmail.com">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#border-image-width">

<!-- Editorial of the spec.
 > Since by default a border image is only drawn in the border area, by default a border-style of none will make
 > it disappear. However, the border-image-outset and border-image-width values can alter the “border” area into
 > which the border image is drawn, extending it into the padding area (in the case of border-image-widths greater
 > than the border-width) or extending it outside the border edge (in the case of border-image-outset greater than zero).
-->
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/655#issuecomment-331059128">
<link rel="match" href="border-image-width-should-extend-to-padding-ref.html">
<title>
  `border-image-width` should extend into padding given an empty border area via `border-style: none`
</title>
<style>
    div {
        width: 200px;
        height: 200px;
        margin: 20px;
        background-color: silver;
        border-image-source: linear-gradient(blue, orange);
        border-image-slice: 32;
        border-image-repeat: repeat;
        border-image-width: 32px;
        border-style: none;
    }
</style>

Test passes if a 200x200px (content + padding + border) box with a 32px border-image is rendered.
<div></div>