I recently started using Polymer to build a fluid material design website for myself, but I've run into some issues.
I'd like to have an iFrame that is dynamically loaded with various page's content inside of the core-header-panel, beneath the core-toolbar. The loading works, however, the iFrame will not fill the full height of the core-header-panel. I've tried setting its height to the height of the core-header-panel but that returned null. height=100% in both the tag itself AND in CSS don't work. I have no idea how I would get this to work, but I am open to an alternative solution aside from an iFrame. Width stretches fine, height doesn't scale. I believe I am using polymer 0.8 (just downloaded this morning).

Attached is the result with height set to 100%. Similar results are produced with every other method.