测试文字测试文字
重置
svg(dominant-baseline)
auto
use-script
no-change
reset-size
ideographic
alphabetic
hanging
mathematical
central
middle
text-after-edge
text-before-edge
inherit
123456
重置
x
20
50
100
y
20
50
100
123456
重置
startOffset
0
20%
50%
80%
100%