Hi
Tuấn,
I have tried previewing your file on the following mobile devices and I can see the CSS filter working in your Ad:
iphone5 (ios 8.1.2) Safari
ipad mini (ios 8.1.3) Safari
Nexus 5 (4.4.4) Chrome(v42) and Firefox(v38)
HTC (5.0.2) Chrome(v40) and Firefox(v38)
It is also working on my Mac desktop in Firefox (v38), Safari (v8.0.6), Opera (v29), but the CSS filter does not work in the animation when previewing in Chrome (v43.0.2357).
When I look for more info, I found the following about "unprefixed CSS animations" in Chrome (v43):
It said that in Chrome (v43) the unprefixed CSS animation is enabled by default. I suspect that this might be the reason why the CSS filter not working in Chrome for you since your file is published with "Webkit + Mozilla + No Prefix"... I think Chrome (v43) just picked up the "no-prefix" animation in the file, however, Chrome still needs to use the -webkit-filter for CSS Filter so it is causing a conflict and making the CSS filter stops working just in Chrome.
If you publish your file with just "Webkit" option, your Ad should probably work fine in Chrome (v43).
Thanks,
Emily (GWD Team)