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<!DOCTYPE html>
<style>
div::first-line {
background: orange;
}
</style>
<body>
<div>
First line.<br>
Second line.
</div>
<div>
First line in 1st block box.<br>
Second line.
</div>
<div>
First line in 2nd block box.<br>
Second line.<br>
First line after block-in-inline is not ::first-line.<br>
Second line.
</div>
</body>