# Preventing double tap to zoom on mobile (and other good practices)

**URL:** <https://discourse.processing.org/t/preventing-double-tap-to-zoom-on-mobile-and-other-good-practices/22581>\
**Category:** Libraries\
**Created:** [July 12, 2020, 9:06pm UTC](https://discourse.processing.org/t/preventing-double-tap-to-zoom-on-mobile-and-other-good-practices/22581 "2020-07-12T21:06:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![kirkjerk](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/kirkjerk/32/2107_2.png) [@kirkjerk](https://discourse.processing.org/u/kirkjerk)\
**Post date:** [July 12, 2020, 9:06pm UTC](https://discourse.processing.org/t/preventing-double-tap-to-zoom-on-mobile-and-other-good-practices/22581/1 "2020-07-12T21:06:35Z")

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is there a good way to prevent double taps from zooming in/out on the canvas?  
I found  
`user-select: none;`  
is good to stop the text from being highlighted… in theory  
`touch-action: manipulation;`  
should do similar for zooming, but I couldn’t get it to make a difference.

I don’t know what are best practices for locking down zoom and scroll? (Assuming a11y issues aren’t looming)

Anyway the longer story follows:  
Don’t tell my friends or family for whom I might reuse this card (at least til next July 4th) but I made this firework-with-drum-sounds birthday card for a friend:  
[https://toys.alienbill.com/johnny2020/](https://toys.alienbill.com/johnny2020/)  
I ended up solving “why don’t sounds play on mobile?” - [http://kirkdev.blogspot.com/2020/07/play-sound-now-if-you-want-to-play.html](http://kirkdev.blogspot.com/2020/07/play-sound-now-if-you-want-to-play.html) - (I knew mobile doesn’t permit sounds without an interaction, but  
then I had all sounds launched on setTimeout()s - playing one clip of silence on tap freed up the other ones.)