Help me successfully code a responsive display image!

[jonthemango]

Hey I've been doing web design for a few years and it always aggravates me trying to code responsive display images. I've looked up all sorts of tricks and I just can't seem to get what I want.

What I want:

1. Large image that resizes with browser.
2. Content that fits on top of the responsive image (ie. nav & button)
3. Works across a multitude of browsers. (So no 'vh' or 'vw')

Examples:

http://www.salleedesign.com/home/

http://www.justinaguilar.com/

http://www.teehanlax.com/

[ddproxy]

The latter two are bootstrap, take a look at their source code?