[felgall]

Originally Posted by rnd me

with(){}

has been removed from strict JavaScript as being inefficient and unnecessary. Any code you could write using a with statement can be written without the with statement without any signigficant change to the number of characters the code will contain.

For example:

<script type="text/javascript">
"use strict";
with (document.getElementById('something').style) {
   backgroundColor = '#ccc';
   color = '#f00';
}
</script>

would simply give a syntax error because with is no longer a valid JavaScript command. You'd need to use the following instead in order for the code to actually run (which excluding all the spaces is just one character longer):

<script type="text/javascript">
"use strict";
var d = document.getElementById('something').style;
d.backgroundColor = '#ccc';
d.color = '#f00';
</script>

Also eval() works differently in strict JavaScript because it is no longer allowed to interact with variables outside of the eval itself.