Watermark text repeated diagonally css/html

I'm now using svg as a background image. Plain CSS:

body {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' height='100px' width='100px'><text transform='translate(20, 100) rotate(-45)' fill='rgb(245,45,45)' font-size='20'>watermark</text></svg>");
}
<body style="width:100%;height:100%"></body>

Javascript to set the background:

function watermark(text) {
  var body = document.getElementsByTagName('body')[0];
  var bg = "url(\"data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' height='100px' width='100px'>" +
    "<text transform='translate(20, 100) rotate(-45)' fill='rgb(245,45,45)' font-size='20' >" + text + "</text></svg>\")";
  body.style.backgroundImage = bg
}

//for this test
var input = document.getElementById('a');
watermark(input.value);
input.addEventListener('input', function(evt) {
  watermark(this.value);
});
<body style="width:100%;height:100%">
  <input id="a" value="change me" />
</body>

This is pretty similar to Daerik's answer, but I wanted to avoid using an extra element, and automate the watermark text generation.

document.querySelectorAll('.watermarked').forEach(function(el) {
  el.dataset.watermark = (el.dataset.watermark + ' ').repeat(300);
});
.watermarked {
  position: relative;
  overflow: hidden;
}

.watermarked img {
  width: 100%;
}

.watermarked::before {
  position: absolute;
  top: -75%;
  left: -75%;
  
  display: block;
  width: 150%;
  height: 150%;
  
  transform: rotate(-45deg);
  content: attr(data-watermark);
  
  opacity: 0.7;
  line-height: 3em;
  letter-spacing: 2px;
  color: #fff;
}
<div class="watermarked" data-watermark="howbloggerz">
  <img src="http://www.w3schools.com/css/img_fjords.jpg">
</div>

Tags:

Html

Css

Watermark

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