Apple - How can I set a default zoom level in Safari?

According to this post from Apple's Safari Support discussion forum:

1) Create a file named defaultzoom.css (or any name you like, just make sure it has a css extension.)

2) Copy and paste in the following:

    body {  
      zoom: 130%;  
    }

change 130 to whatever number suits you. >100 means zoom in, <100 means zoom out. Don't forget the % percent sign!

3) In safari, go to Preferences > Advanced. Under style sheet, select Other... and point to the file you created.

4) You may need to restart safari for the change to take effect.

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[In the above, both the emphasis and code formatting (for non-code-related text) were added to the original quote by Am1rr3zA].

In the latest version of Safari (11), go to:

Safari -> Preferences -> Websites -> Page Zoom

There you can set the default page zoom for all sites or a specific site.

This seems to be a native feature of Safari now (the Page Zoom setting under the Advanced tab in preferences is gone.)

There is a wonderful safari extension, SafariMagnifier, which can set default zoom-in scale for every page.

http://www.wannseii.com/safarimagnifier/