What does a backslash in a CSS media query mean?

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I found the following internal CSS on Reddit's homepage:

@media only screen and (-webkit-min-device-pixel-ratio: 2), \
only screen and (   min--moz-device-pixel-ratio: 2), \
only screen and (     -o-min-device-pixel-ratio: 2/1), \
only screen and (        min-device-pixel-ratio: 2), \
only screen and (                min-resolution: 192dpi), \
only screen and (                min-resolution: 2dppx) {
  ._container_1hp4b_42 {
    background-image: url(https://www.redditstatic.com/crypto-assets/v2/marketplace/web/in_feed_unit/bg_2x.png);
  }
}

VSCode seems to think the backlashes are an error. Do they work as an OR operator?

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