Harness status: OK Found 32 tests 24 Pass 8 Fail Pass document.adoptedStyleSheets should initially have length 0. Pass new CSSStyleSheet produces empty CSSStyleSheet Pass title can be set in the CSSStyleSheet constructor Pass CSSStyleSheet.replace produces Promise Pass Constructed style sheets can be applied on document Pass Constructed style sheets can be applied on shadow root Pass Re-attaching shadow host with adopted stylesheets work Fail Attaching a shadow root that already has adopted stylesheets work Pass Re-attaching shadow host and updating attributes work Pass Changes to constructed stylesheets through CSSOM is reflected Pass Constructed stylesheet can be used and modified in multiple TreeScopes Pass Stylesheets constructed on the main Document cannot be used in iframes Pass Stylesheet constructed on iframe cannot be used in the main Document Pass Adding non-constructed stylesheet to AdoptedStyleSheets is not allowed when the owner document of the stylesheet is in the same document tree as the AdoptedStyleSheets Pass Adding non-constructed stylesheet to AdoptedStyleSheets is not allowed when the owner document of the stylesheet and the AdoptedStyleSheets are in different document trees Pass CSSStyleSheet.replaceSync replaces stylesheet text synchronously Fail CSSStyleSheet.replaceSync correctly updates the style of its adopters synchronously Fail Adopted sheets are ordered after non-adopted sheets in the shadow root Fail Adopted sheets are ordered after non-adopted sheets in the document Pass Inserting an @import rule through insertRule on a constructed stylesheet throws an exception Fail CSSStyleSheet.replaceSync should not trigger any loads from @import rules Pass CSSStyleSheet.replace allows, but ignores, import rule inside Fail CSSStyleSheet.replace ignores @import rule but still loads other rules Pass CSSStyleSheet.replaceSync allows, but ignores, import rule inside Pass CSSStyleSheet.replace does not reject on failed imports Pass Cloning a shadow host will not clone shadow root, and also adoptedStyleSheets Pass Importing a shadow host will not copy shadow root, and also adoptedStyleSheets Fail Adopting a shadow host will empty adoptedStyleSheets if adopting to a different document Fail Adopting a shadow host's ancestor will empty adoptedStyleSheets if adopting to a different document Pass Forcing a style update after adding an adopted stylesheet on a disconnected shadow root should not crash. Pass Modifying an adopted stylesheet on a disconnected shadow root should not crash. Pass Constructing a sheet with the default base URL uses the constructor document's base URL for CSS rules