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<!DOCTYPE html>
<title>CSSStyleSheet baseURL</title>
<link rel="author" title="Erik Nordin" href="mailto:enordin@mozilla.com">
<link rel="help" href="https://github.com/WICG/construct-stylesheets/issues/95#issuecomment-593545252">
<div id="target"></div>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script>
function currentLocation() {
const sections = location.href.split("/")
sections.pop();
return sections.join("/");
}
test(() => {
const span = document.createElement("span");
target.appendChild(span);
span.attachShadow({ mode: "open" })
const shadowDiv = document.createElement("div");
span.shadowRoot.appendChild(shadowDiv);
const fileName = "example.png"
const baseURL = `${location.origin}/custom/path/`;
const fullURL = `${baseURL}${fileName}`;
const sheet = new CSSStyleSheet({ baseURL });
span.shadowRoot.adoptedStyleSheets = [sheet];
sheet.replaceSync(`* { background-image: url("${fileName}"); }`);
const styleFromRelative = getComputedStyle(shadowDiv).backgroundImage;
sheet.replaceSync(`* { background-image: url("${fullURL}"); }`);
const styleFromFull = getComputedStyle(shadowDiv).backgroundImage;
assert_equals(styleFromRelative, styleFromFull);
}, "Constructing sheet with custom base URL ueses that URL for CSS rules");
test(() => {
const span = document.createElement("span");
target.appendChild(span);
span.attachShadow({ mode: "open" })
const shadowDiv = document.createElement("div");
span.shadowRoot.appendChild(shadowDiv);
const fileName = "example.png"
const baseURL = "custom/path/";
const fullURL = `${currentLocation()}/${baseURL}${fileName}`;
const sheet = new CSSStyleSheet({ baseURL });
span.shadowRoot.adoptedStyleSheets = [sheet];
sheet.replaceSync(`* { background-image: url("${fileName}"); }`);
const styleFromRelative = getComputedStyle(shadowDiv).backgroundImage;
sheet.replaceSync(`* { background-image: url("${fullURL}"); }`);
const styleFromFull = getComputedStyle(shadowDiv).backgroundImage;
assert_equals(styleFromRelative, styleFromFull);
}, "Constructing sheet with relative URL adds to the constructor document's base URL");
test(() => {
assert_throws_dom("NotAllowedError", () => { new CSSStyleSheet({ baseURL: "https://test:test/"}) });
}, "Constructing sheet with invalid base URL throws a NotAllowedError");
</script>
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