Outdated warnings

[da2x]

The following warnings are outdated as all of these attributes are specified in the current version of HTML5.

• <a> proprietary attribute "referrerpolicy"
• <iframe> proprietary attribute "allow"
• <iframe> proprietary attribute "loading"
• <img> proprietary attribute "decoding"
• <img> proprietary attribute "loading"
• <source> proprietary attribute "sizes"
• <video> proprietary attribute "muted"
• <video> proprietary attribute "playsinline"

[geoffmcl]

@da2x, thank you for the issue, and research...

When you say, outdated, sadly, that may well be true... can you give W3C ref link(s) for each... thanks...

Like, for the first, referrerpolicy, current libTidy does not have this attribute listed, see Known HTML attributes, and the corresponding attribute_defs array, however I found the W3C referrer-policy link, and it seems this attribute should be supported on the a, area, img, iframe, or link elements, with an enumerated set of values, since at least 2017...

So would be relatively easy to ADD support... note the warning that the enum, and table must be in the same order... just add new items to the enum and array ends... see ATTRIBUTES.md for more details, but forget any alphabetic, or other, ordering, groupings... note, this md should be fixed, someday...

And, at this time, seems optional whether an attrIsXXXX(av) macro is added to attrs.h, but open about this...

Need the research, links, conclusions, ... for each case... and maybe a use sample, for testing... thanks...

Look forward to further feedback, comments, links, patches, PR, etc, etc... thanks...

[da2x]

I updated the above list with links to the relevant sections for each attribute in the current spec.

[geoffmcl]

@da2x, thanks for the updated list, with whatwg links... did not check all, but those inspected looked good... and it seems in most cases, libTidy does not presently have these attributes listed...

Now all we need are the patches, PR's, to implement this ;=)) to bring libTidy up-to-date... thanks...

See CONTRIBUTING.md for details of forking, keeping that fork up-to-date, creating, and presenting a PR, in a branch, etc... Ask here, if further help needed... thanks...

[drichardson]

Ask here, if further help needed... thanks...

@geoffmcl I've had the PR #949 opened for about a month now... is there anything else I need to do to get it reviewed?

[balthisar]

@drichardson, @geoffmcl is on sick leave; I'll get to it as soon as I can. It won't be closed, and I'm sorry I can't rush it, either, with a one month old son in the house!

[balthisar]

Closing as fixed via merge #949.

[Seirdy]

@balthisar This issue doesn't seem fixed; several attributes enumerated in the original filing don't appear to be supported, such as referrerpolicy