I'm a complete noob to AEM - front end developer - have a little bit of an emergency question -

How exactly within the AEM authoring environment can I inspect the markup for each of a project's component?

I was given authoring access to a site, I can see a long list of components in various places....I can see how to drag a component onto a page....but most of the components have no visual preview on the page and are showing as just a blank box. I need to review the MARKUP. I cannot find an option anywhere to just view the source code for a component.

Can someone please help with a quick simple answer?

(I've been asked to evaluate the complexity of each component, so just looking at the markup will be exactly what I need)

Thank you AEM folks!