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On macOS, it's possible to use the gesture "pinch to zoom" with the trackpad to zoom onto a page.

This feature works correctly on Chrome when the page is not in fullscreen. It also works correctly when triggering the fullscreen using the upper-right green button of the Chrome window.

However, when triggering the fullscreen programatically using the HTML5 Fullscreen API (webkitRequestFullscreen -- https://developer.mozilla.org/en-US/docs/Web/API/Fullscreen_API), the "pinch to zoom" gesture is disabled.

It's possible to test this out here: when triggering fullscreen using the upper-right green button, "pinch to zoom" works; when using the "Request document", it won't work.

It seems like there are two different fullscreen mode on macOS, but it's hard to find any information on it.

Jonathan Alzetta
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1 Answers1

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This seems to be intentional behaviour, at least on Mobile. See the discussion at https://bugs.chromium.org/p/chromium/issues/detail?id=736520.

Generally, pinch to zoom is meant for legacy websites. If you want some zooming capability in a fullscreen gallery, you will have to code it yourself.

hmu
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