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Opera 12.17 has a slider bar on the lower right of the screen that allows you to make fonts bigger and smaller and does not change the actual screen size of the site's page until you get really really large.

With Chrome you can try this

How to set the font size for all webpages
You can adjust the size of text on webpages.

Click the Chrome menu Chrome menu on the browser toolbar.
Select Settings.
Click Show advanced settings.
In the "Web Content" section, use the "Font size" drop-down menu to make adjustments.
Some websites prevent the browser from changing just text size. For those sites, Chrome won’t be able to adjust the font size.