When using Moodle in a classroom and displaying a Moodle page on a screen, teachers often 'Zoom in' to enlarge the text and so make it easier to read. However, with two of the standard Moodle 2 themes (Overlay and Fusion), zooming in causes the text to disappear. Consequently these two themes are unusable in classroom situations, and also unusable for anyone who needs to enlarge the size of text. I have confirmed this behavior in various browsers on both Windows and Mac. I have attached screen-shots to illustrate this problem.

While investigating this bug, I observed the following three types of behavior when zooming in (i.e enlarging text):

1) The worst behavior: overlay and fusion
on zooming: text to the right of the screen disappears, a right-left scroll bar does not appear which renders the text invisible. See the 'fusion' and 'overlay' screen shots for an example of this behavior.

2) Bad behavior, but just usable: base, brick, canvas, formal white, magazine, splash
on zooming: text to the right of the screen disappears, but a right-left scroll bar appears which means the text can e seen but this solution is not practical in a classroom situation. See the 'Brick' screen shot for an example of this behavior.

3) Good behavior: all other standard themes
on zooming: text to the right is forced to wrap round by a fixed margin meaning text os always visible, there's no need to scroll left to right. See the 'Serenity' screen shot for an example of how things should be.