Doesn't work as HTML

I copied the content of [`hello.html.cpp`](https://github.com/jfbastien/cpp-html/blob/master/hello.html.cpp) into an HTML file, and it didn't render well in Chrome 67:


I was expecting:


Please fix. You may need some changes to https://github.com/whatwg/html.

Start by examining hello.html.cpp and reproducing the reported rendering in Chrome 67, comparing it with the expected screenshot. Then investigate the relevant WHATWG HTML behavior; done means the content renders as shown in the expected image without breaking the generated HTML.

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