Index - I
| identifier | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| iframe | Text.XHtml.Transitional, Text.XHtml | 
| image | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| input | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| ins | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| intAttr | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| isindex | Text.XHtml.Transitional, Text.XHtml | 
| ismap | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| isNoHtml | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| itag | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| italics | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml |