For example, when writing an angular app, you can write some ng-template in inline:
html(data-ng-app="myApp")
body
script(type="text/ng-template" id="myTemplate")
input.form-control(placeholder="Enter your name here") // these two lines
button.btn.btn-default OK! // shouldn't be highlighted as javascript
In the above example, the code should be highlighted as jade. And for good reason: the script tag is not followed by a ., indicating that the following code, compiled by jade, will become tags anyways. So it is not reasonable to highlight them as anything but jade code.