a {
    prop1: func(1px,1px,1px,func(1px,1px,1px,func(1px,1px,1px)));
    prop2: func( 1px ,1px ,1px ,func( 1px ,1px ,1px ,func( 1px ,1px ,1px ) ) );
    prop3: func(1px, 1px, 1px, func(1px, 1px, 1px, func(1px, 1px, 1px)));
    prop4: func( 1px , 1px , 1px , func( 1px , 1px , 1px , func( 1px , 1px , 1px ) ) );
    prop5: func(  1px  ,  1px  ,  1px  ,  func(  1px  ,  1px  ,  1px  ,  func(  1px  ,  1px  ,  1px  )  )  );
    prop6: func(
        1px
        ,
        1px
        ,
        1px
        ,
        func(
            1px
            ,
            1px
            ,
            1px
            ,
            func(
                1px
                ,
                1px
                ,
                1px
            )
        )
    );
    prop7:
        func(
            1px
            ,
            1px
            ,
            1px
            ,
            func(
                1px
                ,
                1px
                ,
                1px
                ,
                func(
                    1px
                    ,
                    1px
                    ,
                    1px
                )
            )
        );
    prop8: very-very-very-very-very-very-vey-very-very-long-func(1px,1px,1px,very-very-very-very-very-very-vey-very-very-long-func(1px,1px,1px,very-very-very-very-very-very-vey-very-very-long-func(1px,1px,1px)));
    prop9: very-very-very-very-very-very-vey-very-very-long-func(  1px  ,  1px  ,  1px  ,  very-very-very-very-very-very-vey-very-very-long-func(  1px  ,  1px  ,  1px  ,  very-very-very-very-very-very-vey-very-very-long-func(  1px  ,  1px  ,  1px  )  )  );
    prop10:
        very-very-very-very-very-very-vey-very-very-long-func(
            1px
            ,
            1px
            ,
            1px
            ,
            very-very-very-very-very-very-vey-very-very-long-func(
                1px
                ,
                1px
                ,
                1px,
                very-very-very-very-very-very-vey-very-very-long-func(
                    1px
                    ,
                    1px
                    ,
                    1px
                )
            )
        );
    prop11: very-very-very-very-very-very-vey-very-very-long-func(
        1px
        ,
        1px
        ,
        1px
        ,
        very-very-very-very-very-very-vey-very-very-long-func(
            1px
            ,
            1px
            ,
            1px,
            very-very-very-very-very-very-vey-very-very-long-func(
                1px
                ,
                1px
                ,
                1px
            )
        )
    );
}

a {
  box-shadow: inset 0 $size $size (-$size) black;
  width: calc(100% - (#{var(--g-spacing)} - #{$iframe-x-padding}) * 2);
  padding-right: (100% * $info-width / (1 - $image-width));
  padding-bottom:
    (
      100% *
      $image-height / ($image-width-responsive + $image-margin-responsive * 2)
    );
}

.foo {
  --paddingC: calc(  var(  --widthB  )  /  2  );
  content: attr(  data-title  );
  color: var(  --main-bg-color  );
  background-color: rgb(  255,  0,  0  );
  background: element(  #css-source  );
  width: calc(  100%  -  (  #{var(--g-spacing)}  -  #{$iframe-x-padding}  )  *  2  );
  padding-bottom:
      (
          100% *
          $image-height  /  (  $image-width-responsive  +  $image-margin-responsive  *  2  )
      );
  padding-top: var(  --paddingC  );
}

.bar {
    prop1: attr(data-foo);
    prop2: attr( data-foo );
    prop3: attr(  data-foo  );
    prop4: attr(
        data-foo
    );
    prop5: attr(
        data-foo
    );
    prop6:
        attr(data-foo);
    prop7:
        attr(
            data-foo
        );
    prop8:
    attr(
    data-foo
    )
    ;
    prop9:"("attr(title)")";
    prop10: "(" attr( title ) ")";
    prop11:  "("  attr(  title  )  ")";
    prop12: "("
        attr(title)
    ")";
    prop13:
        "("
        attr(title)
        ")";
    prop14:
        "("
        attr(
            title
        )
        ")";
    prop15:
    "("
    attr(
    title
    )
    ")"
    ;
    prop16: attr(length em);
    prop17: attr(length  em);
    prop18: attr(length   em);
    prop19: attr(
        length
        em
    );
    prop20:attr(data-size em,20);
    prop21: attr( data-size em , 20 );
    prop22:  attr(  data-size  em  ,  20  );
    prop23: attr(
        data-size em,
        20
    );
    prop24:
        attr(
            data-size em,
            20
        );
    prop25:
    attr(
    data-size
    em,
    20
    )
    ;
}