:-moz-first-node
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:-moz-first-node;
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>CSS
span:-moz-first-node {
background-color: lime;
}
HTML
<p>
<span>This matches!</span>
<span>This doesn't match.</span>
</p>
<p>
Blahblah.
<span>This doesn't match because it's preceded by text.</span>
</p>
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