First screen
Check whether loading screens and main menus feel crowded on narrow devices.
See H5 game viewport pressure before QA finds it.
Simulate common mobile CSS sizes, DPR, top notches, and bottom gesture bars to check whether menus, battle HUDs, dialogs, and controls have enough room.
iPhone 15393 x 852
DPR3.0
safe area59 / 34
Battle HUD
Estimate the space needed for HP bars, skill buttons, and virtual joystick controls.
Safe areas
Keep important buttons away from notches, rounded corners, and gesture bars.