15px 1fr 25px/ 60px 1fr 90px
1fr 2fr/ 1fr 2fr 30px 1fr
[top] "area1 area1" 10px [middle] "area2 area3" 30px [bottom]
"hd hd hd" "nv mn sd" "ft ft ft"
"hd hd hd" "nv mn mn" "ft ft sd"
"hd hd hd" "nv nv nv" "mn mn mn"
"hd hd" 30px "nv nm" 1fr "ft ft" 50px
grid表示
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