How to create a ribbon shape in CSS

Question

http://jsfiddle.net/6HyjZ/

.bookmarkRibbon{
     width:0; 
     height:100px; 
     border-right:50px solid blue;
     border-left:50px solid blue;
     border-bottom:30px solid transparent;
}

<div class="bookmarkRibbon"></div>

I'm struggling to make a version of this shape where the ribbon is pointing right instead of down, how can I achieve this?

Answer 1

Ribbon shape using CSS Clip Path:

.bookmarkRibbon {
  width: 100px;
  height: 60px;
  background: blue;
  clip-path: polygon(0% 0%, 100% 0%, calc(100% - 20px) 50%, 100% 100%, 0% 100%);
}

<div class="bookmarkRibbon"></div>

Pointing down:

.bookmarkRibbon {
  width: 60px;
  height: 100px;
  background: blue;
  clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 50% calc(100% - 20px), 0% 100%, 0% 0%);
}

<div class="bookmarkRibbon"></div>

Ribbon shape using CSS border

To help you visualize the logic step-by-step, so you can apply it easily on any side:

.bookmarkRibbon {
  border:       30px solid blue;        /* All borders set */
  border-left:  0;                      /* Remove left border */
  border-right: 20px solid transparent; /* Right transparent */
  width:        100px;                  /* Increase element Width */
}

<div class="bookmarkRibbon"></div>