Tryit Editor v2.6

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p id="p1">
This is a text.
This is a text.
This is a text.
</p>

<input type="button" value="Hide text" 
onclick="document.getElementById('p1').style.visibility='hidden'">

<input type="button" value="Show text"
onclick="document.getElementById('p1').style.visibility='visible'">

</body>

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</html>