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Diffstat (limited to '')
-rw-r--r-- | toolkit/components/processsingleton/CustomElementsListener.sys.mjs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/toolkit/components/processsingleton/CustomElementsListener.sys.mjs b/toolkit/components/processsingleton/CustomElementsListener.sys.mjs new file mode 100644 index 0000000000..2a522d9fe3 --- /dev/null +++ b/toolkit/components/processsingleton/CustomElementsListener.sys.mjs @@ -0,0 +1,30 @@ +/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// Set up Custom Elements for XUL and XHTML documents before anything else +// happens. Anything loaded here should be considered part of core XUL functionality. +// Any window-specific elements can be registered via <script> tags at the +// top of individual documents. +Services.obs.addObserver( + { + observe(doc) { + if ( + doc.nodePrincipal.isSystemPrincipal && + (doc.contentType == "application/xhtml+xml" || + doc.contentType == "text/html") && + // People shouldn't be using our built-in custom elements in + // system-principal about:blank anyway, and trying to support that + // causes responsiveness regressions. So let's not support it. + doc.URL != "about:blank" + ) { + Services.scriptloader.loadSubScript( + "chrome://global/content/customElements.js", + doc.ownerGlobal + ); + } + }, + }, + "document-element-inserted" +); |