## Setting the Active CSS Definition

The Active CSS Definition tells TopStyle which CSS properties and values to display in style insight and the style inspector. To change the active CSS definition, simply select a new definition from the dropdown shown below.

Only properties and values that are supported by the active CSS definition will appear in style insight and the style inspector. Properties that are invalid (not supported) by the active CSS definition will be color-coded red in the editor. To see this in action, select "Internet Explorer 5" from the CSS definition dropdown, and create a rule which contains the `CURSOR` property. Internet Explorer 5 supports this property, so it's color-coded as normal. However, if you switch to "CSS Level 1," `CURSOR` will now be color-coded red since the cursor property isn't supported by CSS1.

Related topics: TopStyle Style Checker, Error: Invalid Property Value, Error: CSS Definition, Using Style Insight, Style Inspector

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