A few HTMLLint errors

[pdehaan]

Via text input on https://html5.validator.nu/ (and view-source on https://send.dev.mozaws.net/):

1. Error: Bad value localization for attribute rel on element link: The string localization is not a registered keyword.

   1. From line 13, column 3; to line 13, column 61

      en-US">↩  <link rel="localization" href="/locales/send.{locale}.ftl">↩  <sc

2. Error: Bad value /locales/send.{locale}.ftl for attribute href on element link: Illegal character in path segment: { is not allowed.

   1. From line 13, column 3; to line 13, column 61

      en-US">↩  <link rel="localization" href="/locales/send.{locale}.ftl">↩  <sc

3. Error: An img element must have an alt attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

   1. From line 18, column 5; to line 18, column 41

      ogo">↩    <img src="/resources/send_logo.svg"/>↩    <

   2. From line 19, column 5; to line 19, column 46

      vg"/>↩    <img src="/resources/send_logo_type.svg"/>↩  </d

   3. From line 29, column 26; to line 29, column 87

      load-img"><img data-l10n-id="uploadSvgAlt" src="/resources/upload.svg"/></div>

   4. From line 91, column 3; to line 91, column 98

      ></div>↩  <img id="upload-error-img" data-l10n-id="errorAltText" src="/resources/illustration_error.svg"/>↩  <a 

   5. From line 110, column 42; to line 110, column 102

      illa.org"><img class="mozilla-logo" src="/resources/mozilla-logo.svg"/></a>↩ 

   6. From line 118, column 65; to line 118, column 118

      ="_blank"><img class="github" src="/resources/github-icon.svg"/></a>↩ 

   7. From line 119, column 65; to line 119, column 120

      ="_blank"><img class="twitter" src="/resources/twitter-icon.svg"/></a>↩ 

4. Error: The width attribute on the th element is obsolete. Use CSS instead.

   1. From line 43, column 46; to line 44, column 57

      false" -->↩          <th width="35%" data-l10n-id="sentFilesTitle1"></th>↩

   2. From line 44, column 63; to line 45, column 57

      le1"></th>↩          <th width="25%" data-l10n-id="sentFilesTitle2"></th>↩

   3. From line 45, column 63; to line 46, column 57

      le2"></th>↩          <th width="21%" data-l10n-id="sentFilesTitle3"></th>↩

   4. From line 46, column 63; to line 47, column 57

      le3"></th>↩          <th width="12%" data-l10n-id="sentFilesTitle4"></th>↩

5. Error: Bad value true for attribute hidden on element div.

   1. From line 57, column 1; to line 57, column 40

      ↩</div>↩↩<div id="upload-progress" hidden="true">↩  <di

   2. From line 75, column 1; to line 75, column 35

      ↩↩</div>↩↩<div id="share-link" hidden="true">↩  <di

   3. From line 88, column 1; to line 88, column 37

      >↩</div>↩↩<div id="upload-error" hidden="true">↩  <di

   4. From line 95, column 1; to line 95, column 44

      >↩</div>↩↩<div id="unsupported-browser" hidden="true">↩  <di

[pdehaan]

TL;DR:
I think results (1) "Error: Bad value localization for attribute rel on element <link>: The string localization is not a registered keyword." and (2) "Error: Bad value /locales/send.{locale}.ftl for attribute href on element <link>: Illegal character in path segment: { is not allowed." are bogus.

I don't think (3) "Error: An <img> element must have an alt attribute, except under certain conditions." is entirely valid either, since I think we're injecting localized alt="" attributes through jQuery.

That only leaves (4) "Error: The width attribute on the <th> element is obsolete. Use CSS instead." and (5) "Error: Bad value true for attribute hidden on element <div>.", which I think are semi-valid.

[uname-yang]

About /locales/{locale}/send.ftl part , i think this is not a bug.
This is how l20n.js use.
Please read the doc:

[pdehaan]

Closing this in favor of #139 meta-bug.
Out of that list above, I believe only (4) and (5) were errors, and they're already being tracked separately as:

• (4) The “width” attribute on the “th” element is obsolete. Use CSS instead The “width” attribute on the “th” element is obsolete. Use CSS instead #436
• (5) Bad value “true” for attribute “hidden” on element “div” Bad value “true” for attribute “hidden” on element “div” #441