Chrome os:
Version 72.0.3626.48(Platform 11316.64.0-19.01.06) dev-channel kevin test 
Google_Input_Tools_Version:72.0.20190106.228096708(chrome-input-tools_m72_RC08)

REPRO STEPS:
1.Switch to any keyboard (e.g. US), and switch to HW layout.
Go to jd.com.
2.Add something to Cart.
3.Fill the order ->Select "Use discount/coupon/credit" ->coupon.
4.Focus on coupon code input-boxes, draw something.
5.Repeat step #4 several times.


Actual result: 
Nothing is submitted after drawing. 

Note:
Tried repro 6/6 times. Sometimes not need to repeat step #4.
 

Deleted: Jan 8, 2019 4_45 PM.webm 1.9 MB

	Jan 8, 2019 4_45 PM.webm 1.9 MB View Download