The script and noscript elements are not supported. Usually small devices have limited memory and CPU power. Execution of script programs may not be supported. Contents should be readable even if scripts are not executed. Event handler attributes used to invoke script programs are not supported.
Events are device dependent.
An incoming-call event is unlikely to happen in a television. A generic event handling mechanism would be more appropriate than hardwiring the event names in the document type definition. Many simple Web clients cannot display fonts other than monospace. Bi-directional text, bold faced font, and other text extension elements are not supported. However, phrasal elements such as emphasize, em, and headings are supported.