.imageWithSrcAttribute {
    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='', sizingMethod='scale' );
    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='',   sizingMethod='scale' )
    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src=  '',   sizingMethod='scale' );
    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src=  '',  
       sizingMethod='scale' );
    filter : progid:DXImageTransform.Microsoft.AlphaImageLoader(src=  '',  sizingMethod='scale' );
    filter : 
        progid:DXImageTransform.Microsoft.AlphaImageLoader(src=  '',   sizingMethod='scale' );
    color:red;
    background: url()
}
#outer {
  filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(
      src='',
      sizingMethod='scale');
}
@font-face {
    src: url();
}
.relativeImageBackgrounds {
    background: #B3B3B3 url();color:red;
    background: url();
    background: url();
    background: url('');
    background: url("");
    background: url() top left;
    background: url() repeat-x;
    background: url() no-repeat right;
    BACKGROUND-IMAGE: url();
    background-image: url();
    background-image: 
     #555 url();
    background-image: 
     url();
    background:
        url()
        0 1.1em no-repeat !important;color:red;
}
.inline {background:#ffffff url('') no-repeat right top;}
.inlineMinimized {background:#ffffff url('') no-repeat right top;color:red;font-size:large;}.anotherClass{color:blue;background:#ffffff url('') no-repeat right top;}
.noQuotes {
    background-IMAGE: URL();
    background: url() red;
    background: url() no-repeat right;
    background: url();
}

.differentTypeOfQuotes {
    background: #B3B3B3 url("") repeat-x 
        scroll 0 -1px;
    background: #B3B3B3 url('') repeat-x
        scroll 0 -1px;
    background: #B3B3B3 url() repeat-x
        scroll 0 -1px
}

.contextPathWithWhitespaces {
    background-image: url( "" );
    background-image: url( '' );
    background-image: url(  );
    background-image: url( "");
    background-image: url( '');
    background-image: url( );
    background-image: url( "" );
    background-image: url( '' );
    background-image: url(  );
    background-image: url("");
    background-image: url('');
    background-image: url("" );
    background-image: url('' );
    background-image: url();
}

.relativePathWithWhitespaces {
    background-image: url( "" );
    background-image: url( '' );
    background-image: url(  );
}

.specialCharacters {
    background-image: url( );
}
@font-face {
    font-family: 'Trade Gothic Condensed Bold';
    src: url('');
    src: url('') format('embedded-opentype'),
    url('fonts/tradegothic-boldcondtwenty-webfont.woff') format('woff'),
    url('fonts/tradegothic-boldcondtwenty-webfont.ttf') format('truetype'),
    url('fonts/tradegothic-boldcondtwenty-webfont.svg#tradegothic-boldcondtwenty-webfont') format('svg');
    font-weight: normal;
    font-style: normal;
}