Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The :-moz-first-node
CSS pseudo-class is a Mozilla extension that represents any element that is the first child node of some other element. It differs from :first-child
because it does not match a first-child element with (non-whitespace) text before it.
Note: Any whitespace at the start of an element is ignored for the determination of :-moz-first-node
.
:-moz-first-node
span:-moz-first-node { background-color: lime; }
<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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https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-first-node