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Simon WillisonDeveloper tools

Shadow roots, explained with live examples

Collected Sep 30, 2026

Simon Willison has released a tool titled "Shadow roots, explained with live examples." The tool is described as an artifact intended to explain shadow roots in CSS through interactive examples, and it is tagged under css.

Willison states that the tool was built using a prompt to Fable 5.1 Medium. No further details about the tool's implementation, the specific examples it contains, or its availability were included in the supplied information.

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Publisher excerpt

Tool: Shadow roots, explained with live examples Prompt to Fable 5.1 Medium: Build an artifact to explain shadow roots in CSS with interactive examples Tags: css