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Test Info:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
@font-face {
font-family: dejavu;
src: url(../fonts/DejaVuSansMono.woff);
}
.test {
margin: 10px;
border: 1px solid gray;
font: 16px/24px dejavu;
word-break: break-all;
width: 10em;
height: 6.5em;
/* we use text-orientation:upright to improve the chances that our
glyphs will have an advance of exactly 1em, as the reference
rendering relies on this */
text-orientation: upright;
color: rgba(0,0,255,0.2);
}
.v-lr { writing-mode:vertical-lr; }
.v-rl { writing-mode:vertical-rl; }
.bgtest {
background: url(4colors.png); /* A square divided into a 2x2 grid of 4 colors; */
/* only the two left squares (blue & cyan) should show */
background-size: 32px;
}
</style>
</head>
<body>
<div class="test v-lr">ABCD<span class="bgtest">EFGHIJKLMNOPQRSTU</span>VWXYZ</div>
<div class="test v-rl">ABCD<span class="bgtest">EFGHIJKLMNOPQRSTU</span>VWXYZ</div>
</body>
</html>