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Last month, we introduced autocomplete options into Pens, triggered by the control + space key command. A lot of people found this useful, so we've stepped it up a notch and added an optional setting for always-on autocomplete!

You can turn it on in your settings page, under the "Editor" section.

From then onward, your editor will suggest completions for HTML elements and attributes, CSS properties and values, and JavaScript functions and variables.