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Chip Cullen's Ligatures.js plugin for jQuery is an extremely lightweight tool automatically inserting ligatures in content where appropriate. Ligatures are glyphs that combine two letter forms into one for stylistic and legibility reasons.

Since it depends on fonts for ligature rendering, it's limited to the four ligatures that are reliably supported: fi, fl, AE, and ae.

The configuration screen lets you pick which text on your site gets ligatures using CSS selectors. Use this plugin to enhance readability in headlines and flavor text on your site.