Complex Content
In Example 1 below we see complex content consisting of pictures and text contained within columns; the text divided into separate paragraphs of varying widths, the columns have graphical borders, and there is very little space between the borders and the content. This is how a person would see it on Internet Explorer with the text size set to "Medium".
Example 1) Complex content in Internet Explorer at "Medium" text setting 
A person with impaired vision, however, might keep the text size set at "Larger"; he would see this same content as shown in Example 2. To get the content to look as good as it does at both text sizes requires a fair amount of time and effort. The contents must be placed such that all text flows in a natural manner with the column expanding to accomodate the larger text. The columns had to be reworked so the borders wouldn't display gaps at the larger text size. The page must be tested in various browsers and reworked until acceptable results are achieved at "Medium" and "Large" text settings.
Example 2) Same complex content in Internet Explorer at "Larger" text setting
Example 3 illustrates what could happen if the designer assumes that all users will view the content at the "Medium" text setting.
Example 3) Poorly planned complex content in Internet Explorer at "Larger" text setting
The text size setting can be defeated in certain browsers so that the content will display as in Example 1 no matter what text size setting is chosen by the user. In most cases, however, this is not a good idea. People usually set the text to a larger size because they have some vision impairment—they must have larger text in order to read comfortably. With our aging population, more and more people need to be able to select a comfortable text size.