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Opera with XHTML

Author Zhou Renjian Create@ 2004-07-08 19:19
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With XHTML declaration:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-US">

The javascript in the XHTML won't be executed! But if I delete the above first line, it will run! Considered as a bug of Opera 7.21 build3218.