I'm not sure what you mean exactly?  Zooming in normal web content, or in any pdf reader, always keeps the top left position the same.  That's what we're doing here.

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The system PDF reader on OS X keeps the center point fixed. I haven't checked on windows since I don't have Acrobat installed.

Comparing with html zooming works isn't useful imho 'cause we reflow html on zooming.

Adobe Reader on Mac works the same way as it does on Windows (keeps top left corner fixed).  I think in this case it's better to be consistent across all of our platforms and also with Reader and HTML content (our goal is to treat PDFs just like normal web pages).

In general, we've tried to keep chrome shortcuts on mac consistent with platform expectations: Cmd-f behaves slightly different from ctrl-f, "view source" is cmd-opt-u, etc. We tried hard to make chrome behave like a "good citizen". I think it'd be great if chrome's built-in PDF support was like that, too :-)

But I'll leave it up to you to reopen this.

(If you think that's a non-goal, tell me, and I will stop filing bugs like this.)

I definitely agree that Chrome should use the Mac specific shortcuts, UI paradigms etc.

I just don't think that Preview's method of zooming is "standard", especially since Reader doesn't work like that on Mac.

Preview _is_ the standard PDF viewing app on mac. Most people don't use Reader.

*shrug*

What I mean is that do all apps with text center on the midpoint when zooming?  I don't have Office installed there so I can't tell.  I don't think one app is enough to make something like this standard on an OS.  Preview chooses to center when zooming, and we don't, that's a decision left to the app.  But I don't think this means that we're breaking platform expectations..

Happy to reconsider if UI folks feel strongly about this or tons of users complain.

Finder's Quicklook feature does it too.

I think iPhoto and Keynote zoom on center as well, but I can't check until I'm at home.

I went through most of the apps on my home mac. All document viewer type apps that don't reflow text on zoom keep the center fixed. I tested the following:

iPhoto (photo management), Acorn (photo editor), Finder (the Mac's explorer), Preview (document viewer), Pixelmator (photo editor), VectorDesigner (vector drawing program), Skim (pdf reader), Graphviz (viewing and laying out directed and undirected graphs), OmniGraffle (vector drawing program)

I think Keynote also keeps the center fixed, but I don't have it installed at the moment.

Programs that reflow text usually don't keep the center point fixed; I tested Vienna, Mail, Safari, Chrome.

I think this shows that the this is the system expectation.

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