HTML and CSS irregular triangle image gallery

Question

I need to create an image gallery, in which the individual images are irregular triangles (emphasis on irregular).

I found limited examples on how to achieve triangle images via html and css, without modifying the images themselves. One example I found in this CodePen https://codepen.io/thebabydino/pen/liDCz was a step in the right direction, but looking at it, I can't find a way to make the images irregular triangles.

The result I am trying to achieve is this:

  <div class='pageOption'>
      <a href='#' class='option'>
          <img src='~/images/team/pic_paggas/A.png'>
      </a>
      <a href='#' class='option'>
          <img src='~/images/team/pic_paggas/D.png'>
      </a>
   </div>

This is the basic HTML I will be using and the CSS is:

.pageOption {
    overflow: hidden;
    position: relative;
    margin: 0 auto;
    width: 40em;
    height: 27em;
}

.option, .option img {
   width: 100%;
   height: 100%;
}

.option {
    overflow: hidden;
    position: absolute;
    transform: skewX(-55.98deg);
}

.option:first-child {
    left: -.25em;
    transform-origin: 100% 0;
}

.option:last-child {
    right: -.25em;
    transform-origin: 0 100%;
}

.option img {
    opacity: .75;
    transition: .5s;
}

    .option img:hover {
        opacity: 1;
    }

.option img, .option:after {
    transform: skewX(55.98deg);
    transform-origin: inherit;
}

Mind that the HTML and CSS I have may not be the optimal for my problem. I think the shape of the images I am using (rectangular) have something to do with this.

Would be better if the solution is better supported across browsers.

Answer 1

You can do it with skew like below if you cannot use clip-path:

.box {
  overflow: hidden;
  width: 200px;
  height: 200px;
  display:inline-block;
}

.triangle {
  width: 100%;
  height: 100%;
  transform: skewX(-20deg) skewY(45deg); /* 27deg instead of 20deg to have a regular triangle */
  transform-origin: bottom left;
  overflow: hidden;
  background-size:0 0;
}
.triangle.bottom {
  transform-origin: top right;
}

.triangle:before {
  content: "";
  display: block;
  width: inherit;
  height: inherit;
  background-image: inherit;
  background-size:cover;
  background-position:center;
  transform: skewY(-45deg) skewX(20deg); /* We invert order AND signs*/
  transform-origin: inherit;
}

.triangle:hover {
 filter:grayscale(100%);
}

.adjust {
  margin-left:-120px;
}

body {
 background:#f2f2f2;
}

<div class="box">
  <div class="triangle" style="background-image:url(https://picsum.photos/id/155/1000/800)"></div>
</div>

<div class="box adjust">
  <div class="triangle bottom" style="background-image:url(https://picsum.photos/id/159/1000/800)"></div>
</div>