< p>Write a JavaScript function that will be able to print the content of a webpage to paper. JavaScript is a powerful programming language that provides developers with a plethora of tools to create dynamic web apps and websites. One such feature is the ability to print webpage content directly from a site, without the need for users to manually copy and paste it into a word document before printing. With just a few lines of code, JavaScript can enable the printing of all elements on a webpage or only a specific subset of content.< /p>< p>To print an entire webpage, you can use the window.print() function which will open a dialog box that allows you to select your printer and adjust print settings before printing. For example, you can create a button element that when clicked, will trigger the print function:< /p>< pre>< button onclick="window.print()">Print Page< /button>< p>To print only a specific section of a webpage, you can create a separate print stylesheet that will be applied to the page when it's printed. This will include only the selected content and hide any unnecessary elements such as navigation menus or ads. For example, let's say we want to print only the contents of a div element with an id of "printable".< /p>< pre>< link rel="stylesheet" type="text/css" href="print.css" media="print">< div id="printable">< p>This is the content we want to print.< /p>< img src="image.jpg">< /div>< p>In the above example, we've included a link to a separate print stylesheet with the media attribute set to "print". This ensures that the styles applied to the page will differ when printing compared to viewing the page on screen. We've also wrapped the content we want to print in a div element with an id of "printable".< /p>< p>In the print.css file, we would set the display property to none for any elements that we don't want to print:< /p>< pre>@ media print { #header, #footer, #nav, #sidebar { display: none; } }< p>This would hide all elements with ids of "header", "footer", "nav", and "sidebar" when printed, leaving only the contents of the "printable" div to be printed.< /p>< p>In conclusion, JavaScript provides developers with a simple way to allow users to print webpage content directly from a site. Whether printing an entire page or a specific section, there are various ways to customize the print output through the use of print stylesheets. By incorporating this functionality into your website, you can provide users with a convenient way to save and share content, making your site more user-friendly and engaging.< /p>