IE9 SVG, needs conditional override of 'filter' to 'none'

dabblet.css

.nav {
color: #fff;
   display: inline-block;
   border-radius: 10px;
background: rgb(30,87,153); /* Old browsers */
/* IE9 SVG, needs conditional override of 'filter' to 'none' */
background: url(data:image/svg+xml;base64,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);
background: -moz-linear-gradient(top,  rgba(30,87,153,1) 0%, rgba(125,185,232,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(30,87,153,1)), color-stop(100%,rgba(125,185,232,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top,  rgba(30,87,153,1) 0%,rgba(125,185,232,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top,  rgba(30,87,153,1) 0%,rgba(125,185,232,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top,  rgba(30,87,153,1) 0%,rgba(125,185,232,1) 100%); /* IE10+ */
background: linear-gradient(top,  rgba(30,87,153,1) 0%,rgba(125,185,232,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#1e5799', endColorstr='#7db9e8',GradientType=0 ); /* IE6-8 */
}



.nav a {
color: #fff;
}

.nav ul {
  list-style-type: none;
}

.nav ul,
.nav li {
  margin: 0;
  padding: 0;
   display: inline-block;  
}

.nav h2 {
  display: none;
}

.nav a {
   padding: 15px;
   display: inline-block;
}

.nav.important {
  padding: 15px;
  font-weight: bold;
  box-shadow: 5px 5px 5px rgba(0, 0, 0, .25);
}

dabblet.html

<div class="nav" role="navigation">
<h2>Navigation</h2>
<ul>				
  <li class="middle"><a href="#">O nás</a></li>
							<li class="middle"><a href="#">Pro firmy</a></li>
							<li class="middle"><a href="#">Registrace</a></li>
							<li class="middle"><a href="#">Přihlášení</a></li>
						</ul>
</div>


<div class="nav important">
  Ahoj
</div>

settings.json

{"view":"split","seethrough":"","prefixfree":"1","page":"css"}