You will need a font that allows you to view Hebrew.
javascript alert box with Unicode controls
Click on the button. The "W3C" should be to the left of the Hebrew text.
Assertion: [Exploratory test] When Unicode directional control characters surround text to be displayed on a JavaScript alert, text runs on the dialog box appear in the correct order.
Notes:
This behaviour is not described by the HTML specification. The text in question is preceded by an RLE character and followed by a PDF character.