Where to use quotes?

Where and how should quotes be used in CSS?

width: 150px;        开发者_运维问答 /* or */ width: "150px";
height: 50%;          /* or */ height: "50%";
font-family: Verdana; /* or */ font-family: "Verdana";

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You only need to use quotes if the property value has spaces in it. In practice, I think the only cases in which this is likely to come up are font names and URLs.

Example:

font-family: "DejaVu Sans", sans-serif;