cannot apply drop shadow in IE11

Question

how can i show in internet explorer 11 the same shadow that I can apply in chrome using this rule?

    filter: drop-shadow(6px 6px 7px rgba(0,0,0,0.5));

This is my working chrome markup HTML

<div class="cta-image-container">
<div>
    <svg class="svg-cta-image">
        <image filter="url(#dropshadow)" width="640" height="580" class="cta-image cta-image-1-3" xlink:href="https://anekitalia.com/wp-content/uploads/media/justfun-viaggi-evento-viaggia-split.jpg"></image>
    </svg>
</div>
<div>
    <svg class="svg-cta-image">
        <image width="640" height="580" class="cta-image cta-image-2-3" xlink:href="https://anekitalia.com/wp-content/uploads/media/justfun-viaggi-evento-viaggia-split.jpg"></image>
    </svg>
</div>
<div>
    <svg class="svg-cta-image">
        <image width="640" height="580" class="cta-image cta-image-3-3" xlink:href="https://anekitalia.com/wp-content/uploads/media/justfun-viaggi-evento-viaggia-split.jpg"></image>
    </svg>
</div>
<svg>
    <defs>
        <clipPath id="split-1-3">
            <polygon points="222,580 0,580 0.12,0 176,0"></polygon>
        </clipPath>
    </defs>
</svg>
<svg>
    <defs>
        <clipPath id="split-2-3">
            <polygon points="400,0 196,0 242,580 446,580"></polygon>
        </clipPath>
    </defs>
</svg>
<svg>
    <defs>
        <clipPath id="split-3-3">
            <polygon points="640,0 420,0 466,580 640,580"></polygon>
        </clipPath>
    </defs>
</svg>

and this is the CSS

.cta-image-container svg{
    position: absolute;
}
.cta-image-container {
    width: 640px;
    height: 580px;
    margin: 0 25px 0 25px;
    filter: drop-shadow(6px 6px 7px rgba(0,0,0,0.5));
    position: relative;
}
.cta-image {
    max-width: 100%;
    max-height: 100%;
    position: absolute;
}
.svg-cta-image {
    width: 640px;
    height: 580px;
}
.cta-image-1-3 {
clip-path: url(#split-1-3);
}
.cta-image-2-3 {
clip-path: url(#split-2-3);
}
.cta-image-3-3 {
clip-path: url(#split-3-3);
}

Here you can find a chrome working CODEPEN

Answer 1

As rx2347 pointed out, IE does not support CSS Filter Effects

So the only way to add a drop shadow is apply the effect inside your svg by using a blurred black polygon positioned behind the image.

This is an updated version of your codepen with the applied effect https://codepen.io/samwalker/pen/XWbzpZX

I don’t have a PC/IE 11 so I used BrowserStack to test and the results below: Notes:

1. I had to increase the size of the viewbox/svg so the shadow wasn’t clipped

<svg class="svg-cta-image" viewBox="0 0 660 600">

2. Created the feGaussianBlur as an svg filter def.

<filter id="blurFilter">
    <feGaussianBlur stdDeviation="5" />
<filter />

The 'blur size' is set by the stdDeviation attr.

A good tool to show what is possible with IE filters is Hands on: SVG filter Effects it’s part of Azure websites & shows MS IE compatible filters

---

3. Created a group element inside the SVG the same shape as clip-path, this is our 'shadow'

 <g id="shadow" fill="black" filter="url(#blurFilter)" fill-opacity="0.5">
    <polygon points="222,580 10,580 10,10 176,10"></polygon>
    <polygon points="400,10 196,10 242,580 446,580"></polygon>
    <polygon points="640,10 420,10 466,580 640,580"></polygon>
 </g>

The shadow’s style is set with fill colour and fill-opacity.

I had to offset the polygon’s start points by 10px to match the new position of the image.

---

4. Combined the 3 polygons into a single clipping path so you only need to load the image once. If you are going to use 3 different images you can easily change this back.

---

5. Offset the image from the edge of the svg box and reset it’s size x="10" y="10" width="640" height="580", you maybe want to do this in the css.

---

There are probably some changes you’ll want to make but hopefully this will get you on the right path.

Full markup below:

.cta-image-container {
  width: 660px;
  height: 600px;
  margin: 25px auto;
  position: relative;
}

<div class="cta-image-container">
  <div>
    <svg class="svg-cta-image" viewBox="0 0 660 600"><!-- increased veiwbox by 20px so shadow isn’t clipped -->
      <defs xmlns="http://www.w3.org/2000/svg">
        <clipPath id="split-in-3"><!-- combined clipping path -->
          <polygon points="222,580 0,580 0.12,0 176,0"></polygon>
          <polygon points="400,0 196,0 242,580 446,580"></polygon>
          <polygon points="640,0 420,0 466,580 640,580"></polygon>
        </clipPath>
        <filter id="blurFilter">
          <feGaussianBlur stdDeviation="5" /><!-- size of shadow -->
        <filter />
      </defs>
      <g id="shadow" fill="black" filter="url(#blurFilter)" fill-opacity="0.5"><!-- `fill` & `fill-opacity` set the shadow’s color -->
        <polygon points="222,580 10,580 10,10 176,10"></polygon><!--`0`s replaced by 10 to offset shadow from edge of svg -->
        <polygon points="400,10 196,10 242,580 446,580"></polygon>
        <polygon points="640,10 420,10 466,580 640,580"></polygon>
      </g>
            
      <image clip-path="url(#split-in-3)" x="10" y="10" width="640" height="580" class="cta-image cta-image-1-3" xlink:href="https://anekitalia.com/wp-content/uploads/media/justfun-viaggi-evento-viaggia-split.jpg"></image><!-- positioned at 10px `x` & `y` to offset from edge of svg --><!-- reset size to match original -->
            
    </svg>
  </div>
</div>