The URL is the URL of the content be displayed in the browser.
Note: The URL must be a standards-compliant URL. In particular,
file: URLs must be of the form file://<b>absolute path</b> , and the
path should be URL-encoded.
See RFC 1738, section 2.2.
Note: The URL reflects the currently displaying page in the
browser, and will change when navigating to another page. Setting the
htmlText will result in the URL being empty.
Note: Setting the URL won't necessarily cause resources to be
reloaded unless URLs of the resources explicitly change. However,
you can force the browser widget to reload a page using
do "location.reload()" in widget "browser" after setting the url.
Note: Setting the URL to empty will clear the currently loaded
page, resulting in a blank page being displayed and the URL and
htmlText of the widget being empty.
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