Suppose you have a two-column layout using Twitter Bootstrap, in which you want to have specific rows vertically aligned with each other:
For what I know, I would test these solutions.
Solution 1 : Using Javascript (Jquery if you want) to detect the height of the left and the right div, and to tell them to have the same height.
You can apply this solution on the second content div to make the espace above your bold text having the same height.
Or to add.. for example as margin-top as needed in the smaller div (with bold text which need to be aligned) after comparing the heights of both.
Anyway, if you have both of theirs heights you will have enought informations to find a way. Multiples solutions are possible here, I let you find the better one for your context and needs.
Column 1
Optional content of variable height.
Align this vertically...
Column 2
// make this empty div have the same height that the left one with variable content
...with this
Solution 2 (but with some browsers incompatibilties) : Use Flexbox <3 which is a native CSS3 fonctionnaly that give you a easy way to have your wanted divs' positions. http://flexboxfroggy.com/ https://css-tricks.com/snippets/css/a-guide-to-flexbox/
I think that both of these works with bootstrap and will respect responsive needs.