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scss

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$mobile: only screen and (max-device-width: 720px),
only screen and (-webkit-min-device-pixel-ratio: 1.5) and (max-width: 720px);

@media #{$mobile}{
    font-size: (100vw/7.5);
}

Less

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@mobile: ~"only screen and (max-device-width: 720px), only screen and (-webkit-min-device-pixel-ratio: 1.5) and (max-width: 720px)";

@media @mobile{
    font-size: (100vw/7.5);
}

postcss

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@custom-media --mobile only screen and (max-device-width: 720px),
                       only screen and (-webkit-min-device-pixel-ratio: 1.5) and (max-width: 720px);

@media (--mobile){
    font-size: (100vw/7.5);
}