The headings used to document each item of the Language Reference are described in Table 20-3.
| 
 Heading  | 
 Description  | 
|---|---|
| 
 Availability  | 
 Indicates when the item was added to ActionScript (or became an Action, if the item predates formal ActionScript). Also summarizes backward-compatibility and deprecation status.  | 
| 
 Synopsis  | 
 Illustrates the abstract syntax required by the item. Italicized code indicates text that must be provided by the programmer.  | 
| 
 Arguments  | 
 Applies to method and function entries only. Describes the parameters used with the method or function, as listed in the Synopsis.  | 
| 
 Returns  | 
 Applies to method and function entries only. Describes the return value of the method, if any. If the method does not have a return value, this heading is omitted.  | 
| 
 Access  | 
 Applies to property entries only. Describes whether the property value may be retrieved ("Read-only") or both retrieved and assigned ("Read/write").  | 
| 
 Description  | 
 Explains how the item works and how it might be used in a practical scenario.  | 
| 
 Usage  | 
 Describes noteworthy peculiarities of the item.  | 
| 
 Bugs  | 
 Describes known problems associated with the item.  | 
| 
 Example  | 
 Offers sample code showing the item in use.  | 
| 
 See Also  | 
 Lists cross-references to related topics.  | 
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