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# HTML DOM open() Method
[ Document Object](#)
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## Definition and Usage
The open() method opens an output stream to collect the output from the [document.write()](#) or [document.writeln()](#) methods.
After calling the open() method to open a new document and setting the document content with the write() method, you must remember to close the document with the [document.close()](#) method and force its content to display.
**Note:** If the target file already exists, it will be cleared. If this method has no parameters, a new window (about:blank) will be displayed.
## Syntax
document.open(_MIMEtype_,replace)
| Parameter | Description |
| :--- | :--- |
| MIMEtype | Optional. Specifies the type of the document being written. The default value is "text/html". |
| replace | Optional. When this parameter is set, it can cause the new document to inherit the history entry from the parent document. |
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## Browser Support
The open() method is supported by all major browsers.
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## Example
## Example
Open an output stream and add text, then close the output stream:
function createDoc(){
var doc=document.open("text/html","replace");
var txt="Learning HTML DOM is fun!";
doc.write(txt);
doc.close();
}
[Try it yourself »](#)
## Example 2
Open an output stream (a new window; about:blank), add text, then close the output stream:
var w=window.open();
w.document.open();
w.document.write("