Render HiGlass viewer inside Shadow DOM - #208
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nvictus merged 5 commits intoMar 1, 2026
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March 1, 2026 02:24
HiGlass v2.2.2 exports its CSS as `hglib.CSS`, which lets us encapsulate viewer styles using the Constructable Stylesheets API and a Shadow DOM. This prevents HiGlass styles from leaking into (or being affected by) the host notebook environment. The wheel event handler now also calls `preventDefault()` in addition to `stopPropagation()`. With the shadow DOM boundary, `stopPropagation()` alone wasn't sufficient to prevent page scrolling in marimo since composed events cross the shadow boundary.
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March 1, 2026 02:56
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HiGlass v2.2.2 exports its CSS as hglib.CSS, which lets us encapsulate viewer styles using the Constructable Stylesheets API and a Shadow DOM. This prevents HiGlass styles from leaking into (or being affected by) the host notebook environment.
The wheel event handler now also calls preventDefault() in addition to stopPropagation(). With the shadow DOM boundary, stopPropagation() alone wasn't sufficient to prevent page scrolling in marimo since composed events cross the shadow boundary.
higlass-python in marimo: