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Tool: Shadow roots, explained with live examples Simon Willison’s Weblog Subscribe 23rd September 2026 Tool Shadow roots, explained with live examples — Learn about shadow DOM through interactive examples that demonstrate style encapsulation, inheritance, slots, parts, and JavaScript access. Explore how shadow roots create isolated DOM trees with private stylesheets and elements that interact with the page DOM in specific, controlled ways. Prompt to Fable 5.1 Medium: Build an artifact to explain shadow roots in CSS with interactive examples Recent articles Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war - 22nd September 2026 Jev introduces a new shape of LLM - System One, aka Decision Models - 21st September 2026 Generating running routes with GPT-6 Astra and ChatGPT Work - 12th September 2026 This is a beat by Simon Willison, posted on 23rd September 2026. css 241 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026