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the shapes of css
all of the below use only a single html element. any kind of css goes, as long as it's supported in at least one browser.
square
#square
rectangle
#rectangle
circle
#circle
/* cleaner, but slightly less support: use "50%" as value */
oval
#oval
/* cleaner, but slightly less support: use "50%" as value */
******** up
#********-up
******** down
#********-down
******** left
#********-left
******** right
#********-right
******** top left
#********-topleft
******** top right
#********-topright
******** bottom left
#********-bottomleft
******** bottom right
#********-bottomright
curved tail arrow via ando razafimandimby
#curvedarrow
#curvedarrow:after
trapezoid
#trapezoid
parallelogram
#parallelogram
trapezoid
#trapezoid
star (6-points)
#star-six
#star-six:after
star (5-points) via kit macallister
#star-five
#star-five:before
#star-five:after
pentagon
#pentagon
#pentagon:before
hexagon
#hexagon
#hexagon:before
#hexagon:after
octagon
#octagon
#octagon:before
#octagon:after
heart via nicolas gallagher
#heart
#heart:before,
#heart:after
#heart:after
infinity via nicolas gallagher
#infinity
#infinity:before,
#infinity:after
#infinity:after
diamond square via joseph silber
#diamond
#diamond:after
diamond shield via joseph silber
#diamond-shield
#diamond-shield:after
diamond narrow via joseph silber
#diamond-narrow
#diamond-narrow:after
cut diamond via alexander futekov
#cut-diamond
#cut-diamond:after
egg#egg
pac-man
#pacman
talk bubble
#talkbubble
#talkbubble:before
12 point burst via alan johnson
#burst-12
#burst-12:before, #burst-12:after
#burst-12:before
#burst-12:after
8 point burst via alan johnson
#burst-8
#burst-8:before
yin yang via alexander futekov
#yin-yang
#yin-yang:before
#yin-yang:after
badge ribbon via catalin rosu
#badge-ribbon
#badge-ribbon:before,
#badge-ribbon:after
#badge-ribbon:after
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