Comment 2 for bug 1402975

I'm not sure what you expected to happen when you have a div that is relative positioned with "left: 50%" and a left margin of -800px on a screen that is about 341px wide. By my calculation, that puts the left edge of it at about -630px. With the div containing an absolute positioned element with "left: 400px", that puts the start of the text at about -230px - well off the left edge of the screen.

I tested this in Firefox and Chrome in responsive design mode with the screen resolution from mako (569x341 DIPs), and I get exactly the same result. This isn't an Oxide bug at all