iOS: scroll lock should still allow pinch-to-zoom #3602
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Some components require scroll-locking for accessibility purposes; however, it seems that on iOS, this scroll locking was going one step too far, and preventing users from being able to use the pinch-to-zoom gesture. Pinch-to-zoom is important, especially for people with low vision conditions; zooming in helps them read and understand the web page.
On iOS, we we are using the
touch-actionCSS property to disable scrolling around the page. However, instead of setting this property tononeto disable all touch interaction, we can set it topinch-zoom, which should disable all scrolling touch interactions, but still allow the user to zoom in and out as necessary.I discovered this accessibility issue when trying to use a
<Dialog>component from Headless UI. The dialog showed an image, and I wanted to zoom in on the image in order to view it in greater detail, but I discovered that I could not. This change fixes that problem.