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<button class="menu">
<svg width="100px" height="100px" viewBox="0 0 100 100">
<path id="pathA"
d="M 30 40
L 70 40
C 90 40 90 75 60 85
A 40 40 0 0 1 20 20
L 70 70"/>
<path id="pathB" d="M 30 50 L 70 50"/>
<path id="pathC"
d="M 70 60
L 30 60
C 10 60 10 20 40 15
A 40 38 0 1 1 20 80
L 70 30"/>
</svg>
</button>
button
background: transparent
border: none
svg
border: none
display: block
margin: 0 auto
fill: transparent
stroke: #000000
stroke-width: 3px
#pathA
animation: inA .5s ease-in-out forwards
stroke-dashoffset: 280
stroke-dasharray: 250 //line lenght
#pathB
animation: inB .1s linear forwards
stroke-dashoffset: 40
stroke-dasharray: 40 //max 40
#pathC
animation: inC .3s ease-in-out forwards
stroke-dashoffset: 310
stroke-dasharray: 294 //comprimento da linha
&:active
#pathA
animation: outA .5s ease-in-out forwards
stroke-dashoffset: 710
stroke-dasharray: 250 //line lenght
#pathB
animation: outB .1s linear forwards .1s
stroke-dashoffset: 0
stroke-dasharray: 40 //max 40
#pathC
animation: outC .3s ease-in-out forwards
stroke-dashoffset: 841
stroke-dasharray: 294
//in
@keyframes inA
to
stroke-dashoffset: 710
@keyframes inB
to
stroke-dashoffset: 0
@keyframes inC
to
stroke-dashoffset: 841
//out
@keyframes outA
to
stroke-dashoffset: 280
@keyframes outB
to
stroke-dashoffset: 40
@keyframes outC
to
stroke-dashoffset: 310
Also see: Tab Triggers