The general consensus on legibility is that black text on a white background is superior to white text on a black background. (See: White text on black background) But there are some cases where white text on a black background is preferred.
While the question linked above question does provide some answers, I'm still left with other questions regarding the white text on black scenario. Especially considering that nearly all information regarding text legibility assumes black on white.
Keep in mind that the questions below all refer to the white text on a black background scenario.
- Have any studies been done regarding this topic? Especially where the conclusion doesn't boil down to "Don't use white on black".
- What do I look for when picking a font? Maybe provide some examples of good fonts to use.
- Does the optimal line length change?
- Does the optimal line height change?
- Does the optimal character spacing change?
- What is the optimal "black-space" for inbetween paragraphs or content?
- Is there any benefit to adding a subtle text-shadow?
- Is there an optimal contrast ratio between the "white" and "black"?
And in regards to the "black-space" questions, I've read conflicting opinions. One being that white on black needs more space to improve legibility, and the other saying that it needs less space.
What can be done to optimize legibility for white text on black backgrounds?