I've heard that people are having trouble searching for text within the SYCL 1.2.1 spec PDF. Some of the issues appear to be on Mac specifically, but others are cross-platform. The problem may be related to underscores - that's where there are known reproductions.

Problem 1: Searching for italicized text with an underscore misses matches, even on a PDF reader under Windows. For example, SYCL1.2.1r5, p.76, the table has cl_command_queue_info in the right column. I can't make my PDF reader find any portion of the text, once I add an underscore to it.

Problem 2: Non-italicized hits missing on some Mac readers (Safari/Preview). A reproducer of the problem is async_handler. Searching with Safari/Preview on Mac apparently finds 8 results, while Acrobat reader on Mac finds 33 (which is consistent with what I see with a different reader in Windows).