you did not learn this css
table comes with border attributes
table has merged rows and juxtaposed attributes to achieve different rectangular blocks = "colspan,rowspan as for the border style
dashednone definition without borders.
hidden is the same as "none". Except when applied to tables, where hidden is used to resolve border conflicts.
dotted defines a dotted border. Rendered as solid lines in most browsers.
dashed defines a dotted line. Rendered as solid lines in most browsers.
solid defines solid lines.
double defines double lines. The width of the double line is equal to the value of border-width.
groove defines 3D groove borders. The effect depends on the value of border-color.
ridge defines a 3D ridge border. The effect depends on the value of border-color.
inset defines 3D inset borders. The effect depends on the value of border-color.
outset defines 3D outset borders. The effect depends on the value of border-color.
inherit
if not, it can only be implemented in css and css3, for example, inverted triangle
simple explanation:
td is aliased, including border .
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