File | Settings | Editor | Emmet for Windows and Linux

IntelliJ IDEA | Preferences | Editor | Emmet for OS X

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On the nested pages, enable IntelliJ IDEA to use Emmet in HTML, XML, JavaScript (JSX Harmony) files and style sheets.

ItemDescription
Expand abbreviation withUse this drop-down box to select the default key to expand Emmet selectors with.

This key will also by default expand Emmet live templates.

IntelliJ IDEA expands abbreviations only if their output does not exceed 15 KB.