HOW: High jump rules: Each test is given 3 attempts to complete inside an animation frame.

WHAT: Instead of measuring time, we are only checking whether the specific action can be performed in a single animation frame (e.g. less than 17ms). The three tests below are all building a DOM tree of many <span> elements. All three are run with a different number of spans and the results are recorded as pass/fail.

WHY: There are a number of innovations to this approach:

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