None of the journals I've submitted to do double-blind review.
Usually people post their preprints to the arxiv at the same time as sending the article to the journals. This means the information (in a somewhat rougher form) is available immediately, and priority on an idea is established quickly. This has greatly sped up the development of mathematical ideas, but, yeah, essentially means one can search for the article being reviewed, and that double-blind review is more-or-less impossible.
OTOH, double-blind review is a great way to deal with conscious and unconscious institutional and gender biases, so would be great to have...
Usually people post their preprints to the arxiv at the same time as sending the article to the journals. This means the information (in a somewhat rougher form) is available immediately, and priority on an idea is established quickly. This has greatly sped up the development of mathematical ideas, but, yeah, essentially means one can search for the article being reviewed, and that double-blind review is more-or-less impossible.
OTOH, double-blind review is a great way to deal with conscious and unconscious institutional and gender biases, so would be great to have...