CSSStyleSheet-constructable-baseURL.html

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This WPT test may be referenced by the following Test IDs:
- /css/cssom/CSSStyleSheet-constructable-baseURL.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>CSSStyleSheet baseURL</title>

<link rel="author" title="Erik Nordin" href="mailto:enordin@mozilla.com">

<link rel="help" href="https://drafts.csswg.org/cssom-1/#dom-cssstylesheetinit-baseurl">

<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>