Normalize hook default Web behaviour

[Ian Hickson]

Hello again,

I'm looking at what the default behaviour of the Web's normalize hook 
should be. I've read through the links people have posted about this 
before, e.g. [1], but they tend to focus on the behaviour for sensible 
inputs and ES6-only inputs, so I'm not sure the following cases are 
really covered by those.


The first case is around normalization vs location. Suppose a page has 
this markup:

   <base href="http://example.com/">
   <script type=module href="http://example.com/foo.js"></script>
   <script type=module> import "foo"; </script>

Do we want foo.js to be downloaded and executed once, or twice?


Second case:

   import "test/";

What should that do:

   throw in the normalize hook?
   import the file at "http://example.com/test.js"?
   import the file at "http://example.com/test/.js"?
   import the file at "http://example.com/test/default.js"?


Third case: empty string. What should get imported, if anything, if you 
do something like this?:

   import "";


Fourth case: Suppose the referrer name is "foo/bar", the base URL is 
"http://example.com/baz/", and a module tries to import "../../../quux".

What should get imported?

   "http://example.com/baz/quux.js", because you only apply the "../" 
   resolution to the referrer name, and trim leading "../"s.

   "http://example.com/quux.js", because you apply the "../"
   resolution to the referrer name and the base URL, and trim leading "../"s.

   nothing, throw an exception because the ".."s go beyond the referrer 
   name's root.

   nothing, throw an exception because the ".."s go beyond the domain root 
   when normalised.




[1] https://github.com/dherman/web-modules/blob/master/browser-loader/requirements.md

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
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