How to align content of a div to the bottom

Answer 1

Inline or inline-block elements can be aligned to the bottom of block level elements if the line-height of the parent/block element is greater than that of the inline element.*

markup:

I'm at the bottom

css:

h1.alignBtm {
  line-height: 3em;
}
h1.alignBtm span {
  line-height: 1.2em;
  vertical-align: bottom;
}

*make sure you're in standards mode