<p><code>box-sizing</code> is in the list of CSS3 properties and the others mentioned like <code>margin</code>, <code>padding</code> are CSS1 properties.</p>
<p>CSS1 and CSS2 properties by intention have a different color than CSS3 properties, see this example:</p>
<p><a target="_blank" href="https://user-images.githubusercontent.com/9009011/37566353-30ceca78-2ab8-11e8-83a6-6966b62830a9.png"><img src="https://user-images.githubusercontent.com/9009011/37566353-30ceca78-2ab8-11e8-83a6-6966b62830a9.png" alt="geany-css-example" style="max-width:100%;"></a></p>
<p>So the question is answered and the behaviour is as implemented. IMHO this should be closed.</p>

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