<!doctype html>
<html>
<head>
<style>
#target1:matches(::first-letter) {
    background-color: lime;
}

#target2:matches(::after) {
    background-color: lime;
    content: "cocoa";
}

#target3:matches(::before) {
    background-color: lime;
    content: "cappuccino";
}

#target4:matches(::before, ::after) {
    background-color: lime;
    content: "around";
}

#target5:matches(::first-letter, p) {
    background-color: lime;
}

#target6:matches(p, :matches(p, ::first-letter)) {
    background-color: lime;
}

#target7:matches(::before, ::after, *) {
    background-color: lime;
    content: "around";
}

#target8:not(:matches(::first-line)) {
    background-color: red;
}

::first-line #target9 {
    background-color: red;
}

:matches(::first-line) #target10 {
    background-color: red;
}

#target11:matches(::first-line > p) {
    background-color: red;
}

/* first letter of before content is colored blue. */
#target12:matches(::first-letter, ::after, ::before) {
    background-color: lime;
    content: "around";
}

#target12::first-letter {
    background-color: blue !important;
}

#target13:matches(::after > p) {
    background-color: red;
    content: "bug";
}

#target14:matches(::after) > p {
    background-color: red;
}

#target15:matches(::after > p) > p {
    background-color: red;
}

#target16:matches(*) > p {
    background-color: lime;
}

</style>
</head>
<body>
<div>
    <p id="target1">pseudo element inside :matches has effect.</p>
    <p id="target2">pseudo element inside :matches has effect.</p>
    <p id="target3">pseudo element inside :matches has effect.</p>
    <p id="target4">pseudo element inside :matches has effect.</p>
    <p id="target5">pseudo element inside :matches has effect, so all selectors should be checked.</p>
    <p id="target6">pseudo element inside nested :matches should have effect.</p>
    <p id="target7">both line itself and before/after should be colored.</p>
    <p id="target8">pseudo element inside :not doesn't have effect.</p>
    <p id="target9">::first-line in non-rightmost fragment always unmatch.</p>
    <p id="target10">:matches(::first-line) in non-rightmost fragment always unmatches.</p>
    <p id="target11">pseudo element in non-rightmost fragment inside :matches always unmatches.</p>
    <p id="target12">before/after contents are colored lime and first-letter of before content is colored blue.</p>
    <p id="target13">non-rightmost pseudo element has no effect.</p>
    <p id="target14"><p>non-rightmost pseudo element has no effect.</p></p>
    <p id="target15"><p>non-rightmost pseudo element has no effect.</p></p>
    <p id="target16"><p>matchType should be effective for normal element.</p></p>
</div>
</body>
</html>