304959 - When an external script file fails to load a warning should be shown in the js console

Status: NEW

(Core :: DOM: Core & HTML, enhancement, P5)

Description

[James Hardy]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.7.10) Gecko/20050717 Firefox/1.0.6
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.7.10) Gecko/20050717 Firefox/1.0.6

at present if an external script is requested with the wrong file path or
filename  it fails silently and an error only occurs when a function that should
have been included is "not defined". In complicated scenarios this can be tricky
to debug. What would be desirable is that a warning (or message - not sure what
would be more appropriate) be raised in the console saying something like
"External javascript file "http://www.yourdomain.tld/non-existant/file.js" could
not be loaded" this would aid debugging immensly

Reproducible: Always

Steps to Reproduce:
1. create this file
<html>
<head>
<title>Test Page</title>
<script type="text/javascript" src="non-existant/file.js"></script>
</head>
<body>
Blank
</body>
</html>
2.do NOT create non-existant/file.js
3.open page and look in the js console. Observe absence of any indication that
the file has or has not loaded

Actual Results:  
no indication that the file has or has not loaded

Expected Results:  
had a message in the console for debugging purposes stating that the file failed
to load.

Comment 1

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046

Move all DOM bugs that haven’t been updated in more than 3 years and has no one currently assigned to P5.

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