Bootstrap/scss/mixins/_table-row.scss

// Tables

@mixin table-row-variant($state, $background) {
  // Exact selectors below required to override `.table-striped` and prevent
  // inheritance to nested tables.
  .table > thead > tr,
  .table > tbody > tr,
  .table > tfoot > tr {
    > td.#{$state},
    > th.#{$state},
    &.#{$state} > td,
    &.#{$state} > th {
      background-color: $background;
    }
  }

  // Hover states for `.table-hover`
  // Note: this is not available for cells or rows within `thead` or `tfoot`.
  .table-hover > tbody > tr {
    $hover-background: darken($background, 5%);

    > td.#{$state},
    > th.#{$state} {
      @include hover {
        background-color: $hover-background;
      }
    }
    &.#{$state} {
      @include hover {
        > td,
        > th {
          background-color: $hover-background;
        }
      }
    }
    @include hover {
      > .#{$state} {
        background-color: $hover-background;
      }
    }
  }
}