Adding text-shadow to p-tags (especially) in IE10, and you want to positioning your shadow by ex. 1px 1px 1px rgba(255, 255, 255, .5); it cuts the text (or make some part of your text invisible!). The issue is the blur-value! Set the blur-value to 0 or 5 – not in between, because it then starts cutting your text (has something to do with the combination of the lengths and the size of the blur-size, and probably also the size of your text)!
Instead of the example I just gave you, try this: text-shadow: 0px 1px 0px rgba(255, 255, 255, .5);