Use Jade `extends` with `block`s rather than copying prose. For the record, here are the differences in the HTML: [diff-ts-dart-html.txt](https://github.com/angular/angular.io/files/275856/diff-ts-dart-html.txt)
Use Jade
extendswithblocks rather than copying prose.For the record, here are the differences in the HTML: diff-ts-dart-html.txt