If any app is going to remind you of an iPhone/iPad, it’s Safari. Once you enter Full Screen mode by clicking the green 
button at upper left (see Full Screen Button), it’s almost exactly like surfing the Web on the iPad. For example:
Zoom in and out with pinch and spread. That is, put two fingers on your trackpad and spread them to magnify the Web page, or pinch to zoom out. Great when the type is a little too small.
Magnify just a block with a two-finger double-tap. Most Web pages are subdivided into various rectangles of text and graphics. Just as on the iPhone/iPad, you can double-tap (with two fingers on your trackpad) to magnify only one single block of text or graphics. Repeat the process to zoom back out to regular size. (Note that this is tapping, not clicking.)
Use a two-finger swipe for Back and Next. This one’s really juicy. With two fingers on your trackpad, swipe left or right instead of clicking the
or 
buttons. The great part is that if you do this slowly, you pull the previous or next page onto the screen gradually, giving you a chance to peek at it without actually moving to it.
Tip
Each time you open Safari, it brings up whatever pages you had open last. It’s part of OS X’s auto-resume feature.
You’ll rarely do more page scrolling than you do in a Web browser. Scrolling is a constant activity.
Fortunately, Apple gives you about 11,339 different ways to do it.
You can use the regular scroll gesture (two fingers on the trackpad). You can also press your 
and 
keys to scroll one line at a time. Page Up and Page Down scroll in full-screen increments, while Home and End whisk you to the top or bottom of the current Web page. And if your mouse has a scroll wheel, it works, too. (Hold Shift while you’re rolling the wheel to scroll horizontally.)
But maybe the best way of all is to tap the space bar each time you want to see more. Press Shift-space to scroll up. (The space bar serves its traditional, space-making function only when the insertion point is blinking in a text box or the address bar.)
If it seems as though a lot of Web sites are designed with type that’s too small to read, it’s not just you and your aging eyes. Often, it has to do with the high resolution of today’s screens, which work by packing their pixels together more tightly—and making everything look smaller.
Fortunately, Safari is well equipped to help you with this problem. In fact, it offers many solutions:
Enlarge the screen. Press ⌘-plus or ⌘-minus to enlarge or reduce the entire Web page. Or use the two-finger “spread” gesture on your laptop trackpad. Or use the Zoom button, if you’ve added it to your toolbar. The advantage of this method is that the whole Web page’s layout remains proportional.
Magnify a block. Lightly double-tap (don’t fully click) with two fingers on your trackpad to zoom into one block of text or graphics on a page, as described above.
Blow up just the text. If you turn on View→Zoom Text Only, then all those shortcuts serve to magnify or shrink only the text on your page. Graphics remain at their original size. You’re now distorting the original layout, but you’re maximizing the amount of reading you can do before you have to scroll.
Zoom in the usual way. Remember the Control-key zooming technique described in Zoom? It’s not the same thing as the ⌘-plus or ⌘-minus tricks, which keep the window frame and menu at normal size. The Control-key zooming technique magnifies everything—the entire screen, menus and all. It also doesn’t keep text as sharp as the ⌘-plus/⌘-minus trick.
Specify a minimum type size. This may be the best option of all, because it saves you all that zooming. Open Safari→Preferences→Advanced and set the “Never use font sizes smaller than” option to, for example, 14 points. Now every Web page shows up with legible text. (Except a few oddballs that use weird coding to prevent text-size changing.)