mix-blend-mode 混合模式
选择模式：
normal
multiply
screen
overlay
darken
lighten
color-dodge
color-burn
hard-light
soft-light
difference
exclusion
hue
saturation
color
luminosity
mix-blend-mode:
normal
IE
✘
Edge
✘
Firefox
✘ 2+
✔ 32+
Chrome
✘ 4+ ✘ 29+¹
✔ 41+
Safari
✘ 3.1+
◒ 7.1+²
Opera
✘ 9+
✔ 29+
