Jake Archibald • 2/14/2025

Firefox + custom elements + iframes bug

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This technical article explains a long-standing Firefox bug that occurs when a web component (custom element) is moved into an iframe, causing it to lose its custom prototype and instance methods. The author, from Shopify, describes the issue, provides a code example of the failure, and offers a practical solution involving the `adoptedCallback` and `disconnectedCallback` lifecycle methods to restore the element's prototype.

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#web components #custom elements #Firefox
Firefox + custom elements + iframes bug

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