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@testa-soft/dom

v1.5.0

Published

Browser render layer for experiments: crobot-native DOM variation apply (change_html/css/hide_element/append_html/prepend_html/move_element_*) + anti-flicker shielding. Pairs with @testa-soft/experiment-core.

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Readme

@testa-soft/dom

The browser render layer for Testa experiments. Given a variation's changes, it applies them to the DOM and shields the page against flicker while it does. It pairs with @testa-soft/experiment-core (the decision layer): core decides which variation a visitor gets; this package renders it.

You usually don't install this directly. It's the shared DOM engine behind the framework integrations — @testa-soft/next and the client SDK. Install one of those; this comes along as a dependency. It's published so every surface applies variations identically.

What's inside

  • applyVariation(variationId, changes) — apply a variation's crobot-native DOM changes, returning teardowns for the DOM-watching appliers. Change types: change_html, css, hide_element, append_html, prepend_html, move_element_append, move_element_prepend.
  • Late-render safe — a MutationObserver re-targets elements that render after apply (SPA / async content), with a timeout fallback. append/prepend remove their inserted nodes on teardown, so re-applying never stacks duplicates.
  • Anti-flicker shield — raiseShield() / buildShieldSnippet(): hide the page (or a selector) until the variant is applied, with a hard timeout fallback so a slow or broken apply can never leave the page blank. buildShieldSnippet() emits an inlinable <head> IIFE for SSR frameworks.

Install

npm install @testa-soft/dom

Ships ESM + CJS + types. Browser-only (uses document / MutationObserver).

License

UNLICENSED — © testa-soft.