div with triangle at the bottom with background image

Question

I want to make a div, with a triangle at the bottom. But I need the background image on the triangle to appear, I\'ve tried us

Answer 1

Triangle over a plain color

If the triangle is displayed over a plain color, you can use this approach with an absolutely positioned pseudo element :

div{
    position:relative;
    background:url('http://i.imgur.com/W27LCzB.jpg');
    background-size:cover;
    min-height:100px;
    padding-bottom:100px;
    overflow:hidden;
}
div:after{
    content:'';
    position:absolute;
    bottom:0; left:0;
    border-left:50vw solid #fff;
    border-right:50vw solid #fff;
    border-top:100px solid transparent;
}

The left and right parts of the triangle are hidden by the left and right borders of the pseudo element. That is why this approach won't work over a gradient or image.

---

Triangle over an image or gradient

In these cases, you can use an inline svg with clipPath and a polygon element :

body, html{
  height:100%;
  background:url('https://farm8.staticflickr.com/7187/6895047173_d4b1a0d798.jpg')no-repeat center center;
  background-size:cover;
}
svg{
  display:block;
  width:100%;
  }

There are other possible approaches for the same result. You can find some here : CSS Transparent arrow/triangle