A CSS question: Why there is sometimes -9000px in the stylesheet? cannot understand how it works.?

Question

I cannot understand how this works text-indent: -9000px;
Why so many pixels? To make it disappear? I tried to apply it, but it wouldn't become clear for me...
Why doesn't the page scroll as wide is 9000 then?

Answer 1

Usually that is used to hide the text in some objects and then you could use JavaScript to modify that value and bring the text in the viewable area of the browser. The page does not scroll because the continer for the text acts like a window and actually you move the windows contents in any direction. Imagine your self watching out through a window. If you move a few steps to the left or to the right someone from the outside can't see you anymore. Same thing here. The reason why that value is so big is to make sure that you can actually hide the text on every browser since some browsers have margins of different dimensions. Another reason for that big value might be the length of the text. If the text is on a line and it is very long you have to make sure that all of it will be hidden not half or a part of it.

Answer 2

That's all very true, plus there's another reason for the indent to be so large -- so that the screenreaders for the visually impaired can "read" the text that is contained within that particular indent, and yet keeps it invisible for the browsers, thus making that web site more easily accessible for them.

Answer 3

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