'layout-grid-char' Example
<html>
<body>
<p id=myP>This is only a sample text.</p>
<button onclick="myP.style.layoutGridChar='30px'">
Set layoutGridChar to 30px</button>
<button onclick="myP.style.layoutGridChar='auto'">
Set layoutGridChar to auto</button>
</body>
</html>
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