Text Format is not applied to rendered output

Problem/Motivation

1. Rendered output is not processed through an input (check_markup).

This may allow tags you do not want to allow or filter tags that you did want to allow.

Steps to reproduce

1. Enter some HTML elements like or .
2. Select an input format the allows these elements.
3. These tags are filtered out regardless of text format selected.

Proposed resolution

Added markup checks on output code using the selected text format.