what does a placeholder do?
Am I stupid or does it really do nothing you couldn't do without it?
MacBook, OS X Mountain Lion (10.8.2), 4 GB ram iWeb '09 3.0.4
place holders can contain text, video, sound, table, cart or shapes
In keynote, if there are no placeholders on a slide nothing would be visible except the back ground
Their purpose is to hold a specific type of content (a text holder cant contain a sound file)
they can be placed acurately anywhere on the slide
they make it easy to organise different types of content on the slide
they create content in different layers just like transparencies on an overhead projector or in Photoshop
each layer can be placed and rearranged in a particular order
they allow builds to be created to show animations
in the example below, there are four layers in order of ;
layer 4 - white text
layer 3 - red triangle
layer 2 - blue square
layer 1 - grey background