The only problem with this tag is that you need to nest it, to make larger. This is why this tag has been labelled "deprecated"

You can use CSS inline style to set the font-size instead. For example, view my <span> tag below (when editing this page) to see how I set the following text to be 1.5 centimeters hi:

This text is <span style="font-family:comic sans MS, arial, sans-serif;font-size:1cm; color:blue; background-color:yellow">1 centimeters</span> high!