Can media queries use custom units？

[CWH0908]

Use px units for media queries, convert to rem
@media screen and (max-width: 1000px) {
.test {
width: 100px;
}
}

But I use custom units and expect no px conversion, which will cause the media query style to be lost
@media screen and (max-width: 1000customPx) {
.test {
width: 100px;
}
}

[CWH0908]

Can the author help to see the solution？