このデモではRootのElement(document.scrollingElement)に対して横スクロールを発生させていません。
モバイル端末では自動的にviewportが変更されるため、demoに相応しくないためです。

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jump test. to bottom

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jump test. #anchor1

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jump test. to top

jump test. to bottom

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jump test. #anchor2

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