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A comment on CSS arrow please. Parent comment
Ultimately, how the border is joined at the corners is undefined by the specification:
http://www.w3.org/TR/css3-background/#border-style
Many rendering engines will join borders at an angle, producing those diagonal lines.
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Ultimately, how the border is joined at the corners is undefined by the specification:
> Note: This specification does not define how borders of different styles should be joined in the corner. [...]Many rendering engines will join borders at an angle, producing those diagonal lines.