Issues

• [scoped-custom-element-registry] Support deferred scoped registry initialization

  Focus Area: Standards & PolyfillsType: Feature
  webcomponents/polyfills#667 · Filter by author tomherni opened on Jul 10, 2026

• [scoped-custom-elements-polyfill]: Timeline for Native or Cross-Browser Support of Scoped Custom Elements

  webcomponents/polyfills#648 · Filter by author biratdatta opened on Mar 2, 2026
  2

• [ShadowDOM] Implement moveBefore()

  Focus Area: Standards & PolyfillsType: Feature
  webcomponents/polyfills#631 · Filter by author justinfagnani opened on Sep 29, 2025

• [scoped-custom-elements-polyfill]: HTMLFormControlsCollection overwritten with a version that does not support the iterator protocol

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#619 · Filter by author lennartbuit opened on Apr 3, 2025
  1

• [scoped-custom-element-registry] Pulling in from multiple components on a page results in "Illegal constructor (custom element class..." error.

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#615 · Filter by author jmurrayri opened on Mar 4, 2025
  4

• [scoped-custom-element-registry] customize() eagerly swallows any exception and causes a confusing error message

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#608 · Filter by author denilsonsa opened on Feb 24, 2025

• [scoped-custom-element-registry] Non-string Values Are Not Properly Stringified Before Calling attributeChangedCallback in setAttribute

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#607 · Filter by author oscarmarina opened on Jan 24, 2025

• [scoped-custom-element-registry] Update to match new revamped proposal

  Focus Area: Standards & PolyfillsType: Feature
  webcomponents/polyfills#603 · Filter by author sorvell opened on Dec 19, 2024

• [scoped-custom-element-registry] When used, elements defined globally remain undefined

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#602 · Filter by author tpluscode opened on Dec 16, 2024
  2

• [scoped-custom-element-registry] getName is undefined

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#596 · Filter by author coening opened on Sep 30, 2024

• [scoped-custom-element-registry] Release date for new version of scoped-custom-element-registry?

  Focus Area: Standards & PolyfillsType: Feature
  webcomponents/polyfills#593 · Filter by author oscarmarina opened on Sep 20, 2024

• not a bug , but Any guide on how to make this library work, using vite.js and ES6 modules?.

  Focus Area: Standards & PolyfillsType: Featurewontfix
  webcomponents/polyfills#586 · Filter by author moonhuntercode opened on Jul 13, 2024
  1

• Not a Bug but a Question

  Focus Area: Standards & PolyfillsType: Bugwontfix
  webcomponents/polyfills#584 · Filter by author deepanshumehtaa opened on Jun 7, 2024
  3

• [scoped-custom-element-registry] Missing native events on firefox

  Focus Area: Standards & PolyfillsType: Bugwontfix
  webcomponents/polyfills#580 · Filter by author JGiard opened on Apr 2, 2024
  3

• Getting Cannot read property 'polyfillWrapFlushCallback' of undefined on a custom element

  Focus Area: Standards & PolyfillsType: Bugwontfix
  webcomponents/polyfills#577 · Filter by author jz1494 opened on Mar 13, 2024
  1

• __proto__ is used

  Focus Area: Standards & PolyfillsType: Bugwontfix
  webcomponents/polyfills#574 · Filter by author iegik opened on Mar 3, 2024
  2

• [scoped-custom-element-registry] importNode is not a function on latest Chromium

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#570 · Filter by author tlouisse opened on Jan 2, 2024
  3

• [scoped-custom-element-registry] Elements can lose registry when removed from DOM

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#569 · Filter by author sorvell opened on Dec 5, 2023
  2

• Polyfill not loaded when upgrade is not a function

  Focus Area: Standards & PolyfillsType: Bugwontfix
  webcomponents/polyfills#565 · Filter by author Jeroen-Veltmans opened on Oct 17, 2023
  1

• [scoped-custom-element-registry] Attr nodes do not trigger the attributeChangedCallback

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#560 · Filter by author jessevanassen opened on Aug 22, 2023
  1

• TypeError: Attempting to configurable attribute of unconfigurable property on a connected TV browser.

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#558 · Filter by author mateoperez opened on Aug 22, 2023
  3

• [scoped-custom-element-registry] toggleAttribute should only trigger attributeChangedCallback when the attribute is actually toggled

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#556 · Filter by author jessevanassen opened on Aug 22, 2023
  1

• [scoped-custom-element-registry] Audit the polyfill against the current state of the explainer

  Focus Area: Standards & PolyfillsType: Bugwontfix
  webcomponents/polyfills#550 · Filter by author justinfagnani opened on Aug 16, 2023
  1

• [Security Vulnerability] - Insecure Randomness for webcomponents-bundle.js

  wontfix
  webcomponents/polyfills#545 · Filter by author Reni88 opened on May 19, 2023
  1

• [scoped-custom-element-registry] The scoped registry doesn't work if the DOM already contains the web component when it is defined.

  Focus Area: Standards & PolyfillsType: Bug
  webcomponents/polyfills#540 · Filter by author jpzwarte opened on Mar 9, 2023
  2