Ember

Describe the bug
In Firefox, the zoom feature uses transform styles (see storybookjs/storybook#12845) - unfortunately this breaks positioning on elements that require position: fixed when in the "Docs" view.

Normally a position: fixed element's position would correspond to the viewport but in Firefox it corresponds to the element with the transform style.

Issue Summary

KBD macro doesn't look correct with inverse colors (dark mode)

To Reproduce

1. Switch to dark mode in admin
2. Add MD snippet with tag
3. Here's how it looks like
   

Technical details:

• Ghost Version: irrelevant for CSS issue
• Node Versio

By default ember-cli updates a number of the "app trees" to be from tests/dummy when developing an addon locally. We do this for app, styles, templates, public, and tests trees (handled inside lib/broccoli/ember-addon.js).

Unfortunately, we do not forward the apps vendor tree to tests/dummy/. This means that our addon's treeForVendor is called, but then subsequently clobbered by the "apps

Relevant conversation here: hjdivad/ember-m3#807

Breaking docs app is way too easy. See #1700 as a recent example. I think we should add some basic regressions tests. Most of the issues we have seen in the past would have be caught by a test, which simply tries to build the docs app. Maybe running yarn docs:build in CI is good enough as a starter.