Borders and boundaries blur into radical ambiguity when one moves from the physical to the virtual. With the advent of hypertext has come a need to redefine the 'sides' of a text, with questions as to what is 'inside' and what is 'outside' quite impossible to answer. Hypertexts are open, they do not shut out other texts and so difficulty arises as to where one text finishes and another starts. They naturally embody what French philosopher Jacques Derrida's tried to make possible in print text; that is:

a blurring of "all those boundaries that form the running border of what used to be called a text, of what we once thought this word could identify, i.e., the supposed end and beginning of a work, the unitary of the corpus, the title, the margins, the signatures, the referential realm, outside the frame, and so forth."

Derrida, Jacques. A Derrida Reader: Between the Blinds
Columbia University Press, 1991. p. 256.