HTML DOM
HTML DOM writeln() Method
The writeln() method writes one or more strings to a document stream, exactly like write(), but adds a newline character after the output.
Definition and Usage
document.writeln() writes the given text to the document and appends a newline (\n) character. Because HTML collapses whitespace, the newline is usually invisible in rendered output - it only shows inside elements like <pre> that preserve whitespace.
Syntax
document.writeln(text1, text2, ..., textN)It accepts one or more string arguments that are concatenated and written, then followed by a newline. It returns undefined.
Example
<pre>
<script>
document.writeln("Line one");
document.writeln("Line two");
document.writeln("Line three");
</script>
</pre>Inside the <pre> element, each writeln output appears on its own line because the newline it adds is preserved. Outside <pre>, the same code would render on a single line since HTML collapses whitespace.
Like document.write(), calling writeln() after the page has finished loading overwrites the whole document. Prefer innerHTML or DOM creation methods in modern code.