[Vuejs]-Vue server-side rendering: app not being rehydrated, no error thrown

I figured it out: in this case, the problem was that contentMarker should have been <div id=app></div>, without the quotes: the HTML was being minified by webpack.

The result of not doing this is that the entire layout file was being output, and then the rendered Vue template: this meant that the Vue JS was being loaded before the template, so there was no document to rehydrate.

A warning might have been useful, though!