[Edit]

HTML - limit element text selection area on Ctrl+a or cmd+a keys

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<!doctype html>
<html>
<head>
  <style>

    [contenteditable="true"] {
        outline: none;
    }

</style>
<script>
  
  	function isApple() {
    	const expression = /(Mac|iPhone|iPod|iPad)/i;
        return expression.test(navigator.platform);
    }

    function isControl(event) {
        if (isApple()) {
            return event.metaKey;
        }
      	return event.ctrlKey; // Windows, Linux, UNIX
    }

</script>
</head>
<body>
  <p>Some text here...</p>
  <div 
      contenteditable="true"
      spellcheck="false"
      onkeydown="return isControl(event) && event.key === 'a'"
      onpaste="return false"
      ondrop="return false"
  >
    Get focus on this text and press Ctrl+a or cmd+a keys.
  </div>
  <p>Some text here...</p>
</body>
</html>

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  Warning: the above aproach can have some problems on some mobile devicas,
  e.g. Android with Google Chrome Web Browser that do not block content editing.

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