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CSS text width left to right

I'm trying to fade in text from left to right similar to answer found here , but want the text to be hidden behind a transparent background div instead of the example's white background. Is this possible with CSS? Reason being there will be a image behind the text that I'd like to fade in.

Yes, you can simple make it by setup the width from 0 to 100% on @keyframes (as in example in your question) to show the parts of the text.

Small demo-example for you to show is how it work. Click on Zero:

 stripe.onclick = function() { var sec = new Date().getSeconds() % 10; stripe.classList.add('animate'); digit.classList.add('animate'); console.log(); }; 
  #digit { width: 20px; overflow: hidden; font: 32px "Courier New", monospace; cursor: pointer; transition: 2s linear width; } #stripe { width: 20px; transition: 2s linear width; } #stripe.animate { width: 200px; transition: 2s linear width; } #digit.animate { width: 200px; transition: 2s linear width; } 
 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Title</title> <style> </style> </head> <body> <div id="digit"><span id="stripe">0123456789</span></div> <script> </script> </body> </html> 

PS

JS only for test. By @keyframes you do not need them.

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