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Adds `getClientRects()` to fragment instances with a fixture test case. `Element.getClientRect` returns a collection of `DOMRect`s (see example of multiline span returning two `DOMRect` boxes). `fragmentInstance.getClientRects` here flattens those collections into an array of rects.
DOM Fixtures
A set of DOM test cases for quickly identifying browser issues.
Setup
To reference a local build of React, first run yarn build at the root
of the React project. Then:
cd fixtures/dom
yarn
yarn dev
The dev command runs a script that copies over the local build of react into
the public directory.