Sometimes you need to have a page that simply redirects to another page, or to a section of another page. This article describes how to create redirects.
Creating a redirect
Redirects may be needed if a page is merged into another page at some point after its creation, for example. To create a redirect, simply click the redirect button in the toolbar, which looks like this: 
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This brings up a dialog box asking for the name of the destination document and its URL. The name isn't incredibly important; it's mostly useful if you're looking at the redirect page itself and want to know what you're redirecting to. The URL must be a full path from the base of the site, like "/en-US/docs/foo". Relative URLs will not work. However, you can specify a section within the target page using a hashmark ("#") character, such as "/destination/url/here#section_name". This lets you redirect the user straight to that section of the target page.
The redirect should be the only content on the page; before creating your redirect, move all content to its new home. Also, clear any review flags on the original page, to avoid having a mysterious entry in the needs-review listings.
When deleting pages
Before asking for a page to be deleted, consider whether it would be better to turn the page into a redirect to another page on MDN. If a user comes to the page due to an old link, its better to send them to the right page on the site than to have them get a 404 ("page not found") error. Outright deletion of pages is a last resort, typically reserved for spam and other wholly inappropriate content.