JavaScript In HTML: Unexpected Outputs

Jul 23, 2005

I'm learning/experimenting with some simple JS/html markup, running
an apache daemon and mozilla firefox browser in RH 9.

Let's say I run the following markup with one or more of lines 6-10
commented out:

1 <html>
2 <head>
3 <script type="text/javascript">
4 function showinfo()
5 {
6 width = window.screen.availWidth;
7 document.write("<br>screen width=
8 document.write(width);
9 document.write("<br>Date: ");
10 document.write(Date());
11 }
12 </script>
13 </head>
14 <body onload="showinfo()">
15 <p>

My question: is there a simple explanation to account for the 'unexpected'
behaviours below (Runs 1, 3, 5)?

Run 1: nothing in 6-10 commented out; output (expected more):

screen width=

Run 2: line 7 commented out; output (as expected):

Date: Wed Apr 14 2004 20:55:58 GMT-0400 (EDT)

Run 3: lines 7, 9, 10 commented out; output (as expected, but unfinished loading):

[ongoing hourglass indicating loading in progress]

Run 4: lines 7, 10 commented out; output (as expected):


Run 5: lines 7-9 commented out; output (as expected, but unfished loading):

Date: Wed Apr 14 2004 22:46:49 GMT-0400 (EDT)

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would become

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Here are the 3 files (keep in mind wordwrap has jacked up the

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<SCRIPT type="text/javascript" LANGUAGE="JavaScript1.1"

Click the house<BR>
<A ONCLICK="newWindow1('house1.jpg','Nice House')"><IMG

function newWindow1(pic,sitename)
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picWindow.document.writeln('<img src=' + pic + '>');
picWindow.document.writeln('</body> </html>');

function resizewindow()
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