<!DOCTYPE html>
<style>
.container { width:120px; position: absolute; }
.multicol { -moz-column-width:50px; -moz-column-gap:10px; -webkit-column-width:50px; -webkit-column-gap:10px; column-width:50px; column-gap:10px; column-fill:auto; height:150px; border:5px solid black; }
.block { width:50px; height:50px }
.block:hover { background-color: maroon !important; }
.layer { height:200px; width:50px }
.line2 { position: absolute; top: 343px; left: 8px; }
.pos1 { left: 10px; top: 10px; }
.pos2 { left: 150px; top: 10px; }
.pos3 { left: 10px; top: 200px; }
.pos4 { left: 150px; top: 200px; }
</style>
<div class="container pos1">
Overflow:
<div class="multicol">
<div class="block" style="background-color:black"></div>
<div style="overflow:hidden;" class="layer">
<div class="block" style="background-color: #0000f0"></div>
<div class="block" style="background-color: #0000d0"></div>
<div class="block" style="background-color: #0000b0"></div>
<div class="block" style="background-color: #000090"></div>
</div>
<div class="block" style="background-color:black"></div>
</div>
</div>
<div class="container pos2">
Transforms:
<div class="multicol">
<div class="block" style="background-color:black"></div>
<div style="margin-left: -100px; transform: translate(100px, 0);" class="layer">
<div class="block" style="background-color: #0000f0"></div>
<div class="block" style="background-color: #0000d0"></div>
<div class="block" style="background-color: #0000b0"></div>
<div class="block" style="background-color: #000090"></div>
</div>
<div class="block" style="background-color:black"></div>
</div>
</div>
</div>
<div class="container pos3">
Relative Pos.:
<div class="multicol">
<div class="block" style="background-color:black"></div>
<div style="position:relative; margin-left:-100px; left:100px" class="layer">
<div class="block" style="background-color: #0000f0"></div>
<div class="block" style="background-color: #0000d0"></div>
<div class="block" style="background-color: #0000b0"></div>
<div class="block" style="background-color: #000090"></div>
</div>
<div class="block" style="background-color:black"></div>
</div>
</div>
<div class="container pos4">
Opacity:
<div class="multicol">
<div class="block" style="background-color:black"></div>
<div style="opacity:0.99;" class="layer">
<!-- The extra s below force the creation of transparency layers in Skia to work
around optimizations that would cause blending differences between the test and the
expectation. -->
<div class="block" style="background-color: #0000f0"> </div>
<div class="block" style="background-color: #0000d0"> </div>
<div class="block" style="background-color: #0000b0"> </div>
<div class="block" style="background-color: #000090"> </div>
</div>
<div class="block" style="background-color:black"></div>
</div>
</div>