In NSTextView, word completion (F5 or Option+Esc) offers words found in the current document as suggestions, which makes it easier to type names or special terms in long documents, if those appear several times. It would be nice to have the same feature in WebHTMLView. Steps to reproduce: 1. Open a new document 2. Type "supercalifragilisticexpialidocious su" (without quotes) 3. Press F5 Expected results: "supercalifragilisticexpialidocious" should be the first suggestion.