Changes

<thtd>percentage</thtd><thtd>percentage of the block level element</thtd>

<thtd>length</thtd><thtd>length values (in the unit of measure that best suits the medium</thtd>

<thtd>left</thtd><thtd>aligns object to the left on the x - axis</thtd>

<thtd>right</thtd><thtd>aligns object to the right on the x - axis</thtd>