Shadow DOM Testing Lab

A test suite for Shadow DOM, covering visibility, traversal, and styling encapsulation techniques common in Web Components.

Accessible / Automatable

Standard implementation. The content is inside an open shadow root (mode: 'open') and is queryable via `.shadowRoot`.

Light DOM Interaction

Tests how to interact with an element (the button below) which is structurally in the Light DOM but visually placed inside the Shadow DOM via a ``.

CSS Encapsulation

Tests how CSS variables (`--shadow-color`) defined in the Light DOM can penetrate and control styles within the Shadow DOM.

Nested & Closed Challenge

Tests multiple traversal steps (nested) and the absolute barrier imposed by a closed shadow root (closed).

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