HTML Header - Size Limit

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Is there a limit to the size of the text that can be entered on a page's HTML Header Section ?
We are seeing an application page fail when we add more lines to the section .... ( yes - they are valid syntax :-)). When we remove these lines - the page works again.
Also if we add two lines , and then remove the 2 comment lines higher in the section , the page seems to work.
Strange ...
P.

&lt;body onLoad="javascript:f_comm()";&gt;1. In the XHTML normally used in APEX 4.0 mark-up, all XHTML, including attribute/event handler names, must be in lower case: <tt>onclick</tt>, <tt>onfocus</tt>, <tt>onload</tt>...
2. The "javascript:" pseudo-protocol is evil. There are a few places in APEX where we may have to resort to using it as a URL is all we're offered to work with, but it's always better to use an event handler of some kind, either inline or (better) registered dynamically at runtime following the principles of unobtrusive JavaScript. It absolutely should not be used in inline event handlers.
3. Semicolons (";") are part of the JavaScript language, not XHTML, and so go within the quotes as part of the JS code.
So:
&lt;body onload="f_comm();"&gt;

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