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HTML-5 mouse UI input not recognized

In Unreal 4.13.2, using Chrome/Firefox, when launching any game, mouse input is not recognized when clicking anywhere on the game's screen. unless I resize the browser to a smaller size, forcing it to full rescale the content.

After rescaling, I can get the UI buttons to be clickable again. On current APP, we have highlight when mouse cursor is over an UI element and until resize, the UI elements never register.

This was working fine on 4.12 - is there something that has changed with 4.13 that requires setting the mouse input on start differently?

Product Version: UE 4.13
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asked Nov 08 '16 at 03:58 PM in Packaging & Deployment

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Hello chalde,

I was able to reproduce this issue on our end. I have written up a report and I have submitted it to the developers for further consideration. I have also provided a link to the public tracker. Please feel free to use the public tracker for future updates. Thank you for your time and information.

Link: https://issues.unrealengine.com/issue/UE-38410

Make it a great day

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answered Nov 09 '16 at 04:00 PM

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Rudy Q ♦♦ STAFF
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Check out a new WebAssembly + WebGL 2 demo of UE4 at




That demo incorporates a number of the upcoming fixes, and mouse and resizing should work properly.

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answered Mar 09 '17 at 02:56 PM

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