The error detected in the W3Schools validator pertains to CSS for audio elements that do not contain

Could somebody kindly explain why this code is being flagged as an error on w3schools?

audio:not([controls]) {
    display: none;
    height: 0;
}

Answer №1

To prevent extra spaces, it's important to note that Firefox does not currently support selectors of this nature. (Firefox is known for its adherence to rules)

audio:not([controls]) {
    display: none;
    height: 0;
}

Answer №2

According to @Turnip's suggestion, give this a shot:

video:not([controls]) {
    visibility: hidden;
    height: 0;
}

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