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They are one way of accessing the inner and outer text or HTML associated with a tag in Internet Explorer 4+. Using an id attribute, you can access any content of the page in Internet Explorer 4+ using these attributes.
Take the following code as an example: <p id="myid">Here is some <b>interesting</b> text</p>
Then:
<script language="JavaScript"><!-- alert(document.all['myid'].innerText); // shows 'Here is some interesting text' alert(document.all['myid'].outerText); // shows 'Here is some interesting text' alert(document.all['myid'].innerHTML); // shows 'Here is some <b>interesting</b> text' alert(document.all['myid'].outerHTML); // shows '<p id="myid">Here is some <b>interesting</b> text</p>' //--></script>