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<!DOCTYPE html>
<meta charset="UTF-8">
<style>
#highlighted {
background: yellow;
}
</style>
<body><span id="highlighted">This should be yellow, <span id="selected">this should mix with the
selection,</span></span> this should have no background.
<script>
getSelection().setBaseAndExtent(selected, 0, selected, 1);
</script>