悬停时颜色变为灰度，在IE11中不起作用

我在网站上使用了Gray元素。但是，我无法在IE11中使用它。例如，在下面的小提琴中，我使用JS添加grayscale和grayscale-fade类，以便图像在悬停时从彩色逐渐渐变为灰度。我将如何在IE11中使用它？作者说，该插件需要针对IE11进行初始化（即$('article.project img').gray();），但是如果我添加该行，则默认情况下，所有图像从一开始都会变成灰色。我只是想让它在IE11中工作。有人可以告诉我如何吗？

小提琴：http : //jsfiddle.net/61jcam54/

的HTML

<div id="content">
    <article class="project">
        <img width="375" height="375" src="http://i.imgur.com/jNkpAg6.gif" alt="image-title">
        <div class="overlay" style="margin-left: -1px; width: 367px;">
            <h3>Project Title</h3>
            <a class="post-link expand" href="http://google.com">+</a>
        </div>
    </article>
</div>

的CSS

article.project {
  float: left;
  margin: 0 1% 2%;
  max-width: 375px;
  overflow: hidden;
  position: relative;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-user-select: none;
}

article.project img {
  display: block;
  margin: 0;
  padding: 0;
  max-width: 100%;
  height: auto;
  -webkit-transition: all 0.2s ease;
  -moz-transition: all 0.2s ease;
  -o-transition: all 0.2s ease;
  -ms-transition: all 0.2s ease;
  transition: all 0.2s ease;
}

article.project .overlay {
  background: rgba(0, 0, 0, 0.8);
  bottom: 0;
  display: block;
  left: 0;
  opacity: 0;
  overflow: hidden;
  position: absolute;
  right: 0;
  top: 0;
  z-index: 1;
  -webkit-transition: all 0.2s;
  -moz-transition: all 0.2s;
  -o-transition: all 0.2s;
  transition: all 0.2s;
}

.hover .overlay, .active .overlay, .hover-sticky .overlay {
    opacity: 1;
}

article.project .overlay h3 {
  color: #FFF;
  font-size: 17px;
  font-size: 1.7rem;
  font-family: 'Montserrat',sans-serif;
  text-transform: uppercase;
  line-height: 1.3;
  margin-top: 3.3em;
  padding: 0 1em;
  position: absolute;
  text-align: center;
  top: 50%;
  width: 100%;
}

article.project .overlay .expand {
  border: 5px solid #FFF;
  bottom: 0;
  color: #FFF;
  display: block;
  font-size: 30px;
  height: 60px;
  left: 0;
  line-height: 50px;
  margin: auto;
  position: absolute;
  right: 0;
  text-align: center;
  top: 0;
  width: 60px;
  z-index: 2;
  -webkit-border-radius: 30px;
  -moz-border-radius: 30px;
  -ms-border-radius: 30px;
  -o-border-radius: 30px;
  border-radius: 30px;
}

/* GRAYSCALE */
.grayscale, .grayscale-sticky {
    /* Firefox 10+, Firefox on Android */
    filter: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'><filter id='grayscale'><feColorMatrix type='matrix' values='0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0'/></filter></svg>#grayscale");

    /* IE 6-9 */
    filter: gray;

    /*
    Chrome 19+,
    Safari 6+,
    Safari 6+ iOS,
    Opera 15+
    */
    -webkit-filter: grayscale(100%);
}

.grayscale.grayscale-fade {
    -webkit-transition: -webkit-filter .2s;
}

.grayscale.grayscale-off,
article:hover .grayscale.grayscale-fade {
    -webkit-filter: grayscale(0%);
    filter: none;
}

.grayscale.grayscale-replaced {
    filter: none;
    -webkit-filter: none;
}

.grayscale.grayscale-replaced > svg {
    opacity: 1;
    -webkit-transition: opacity .2s ease;
    transition: opacity .2s ease;
}

.grayscale.grayscale-replaced.grayscale-off > svg,
article:hover .grayscale.grayscale-replaced.grayscale-fade > svg {
    opacity: 0;
}

JS

$('#content').on('mouseenter', 'article.project', function(){

    $(this).addClass('hover grayscale grayscale-fade');
    $(this).find('.post-link').hide();

}).on('mouseleave', 'article.project', function(){

    $(this).removeClass('hover grayscale grayscale-fade');
    $(this).find('.post-link').show();

});