Microsoft Internet Explorer, Mozilla Firefox and Google Chrome all share a method of changing the size of text. All let you enlarge or shrink text by rotating the wheel of your mouse. Though you can also change the test size through the browser's options, the mouse wheel lets you quickly scroll through a number of font sizes to compare how they look. This method also works with a number of other programs, such as Microsoft Office applications.
Hold down your keyboard's "Control" key.
Roll the mouse wheel up to increase the size of the browser's text.
Roll the mouse wheel down to reduce the size of the browser's text.
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