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Change the color of a webpage dynamically using JS and CSS

Here’s how to dynamically change a web page’s colors using the CSS filter property and JavaScript:

<a href='javascript:document.querySelector("html").setAttribute("style","filter: saturate(60%) brightness(80%);")'>
  pastel
</a>

<a href='javascript:document.querySelector("html").setAttribute("style","filter: grayscale(100%); ")'>
  grayscale
</a>

<a href='javascript:document.querySelector("html").setAttribute("style","filter:  ")'>
  normal
</a>
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