Issue 5329 - Added standard meta data to website-defaults

includes/meta/standard.tmpl

+<meta charset="utf-8">
+<meta http-equiv="x-ua-compatible" content="ie=edge">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+{% if title %}

[ire, 2017/07/06 08:12:02]

Question: Since these are the standard meta data that *must* be on every page,
is there a way to enforce them? i.e. will things break if there is no title or
description? If not, should we have some form of fallback? e.g. use the
site-wide title and description if a page-specific one is not provided. 

This may not actually matter if the code will never pass review without having a
title and description for each page. 

[juliandoucette, 2017/07/06 13:26:00]

Good question.

- I think title and description should be required
- I wanted to integrate this without breaking existing websites
- I don't want to block this change with the creation of a description for every
page that is currently missing one

Weak conclusion: They must be conditional. 

[ire, 2017/07/07 08:37:43]

Okay I see, makes sense.

This is probably a suggestion that can be dealt with in a separate issue, but do
you think it would make sense to have a site-wide fallback then? For example,
let's say there is no title/description for a specific page on adblockplus.org,
the fallback title/description would be something applicable to the entire site,
e.g. "Adblock Plus" for the title and "Surf the web without annoying ads!" for
the description.

Since we have a relatively small number of sites, we could add this without too
much effort and guarantee that all pages of every site will have a title and
description. 

[juliandoucette, 2017/07/07 11:50:16]

I don't know. 

In (my) theory - a competent parser (search engine, social media) will fall back
to the highest level heading (title) and the first phrasing content it can find
(description) and this may be better than the site title/description because we
don't want people going to specific (non-home) pages that look like home in
search results / social media. - But I'm really speculating here - and I'm
guessing I'm wrong about something.

Do you know anything about this?

[ire, 2017/07/12 08:22:37]

From my (limited) research, I couldn't really find anything to support this
fallback behaviour. Additionally, according to the HTML spec, a title element is
required in most circumstances
(http://w3c.github.io/html/single-page.html#the-head-element) and a page will
fail validation if it is not included. 

I don't think this is the same for description though. So perhaps a fallback
would be necessary for the page title, but not the description. 

[juliandoucette, 2017/07/14 11:40:54]

Acknowledged.

I was wrong about Facebook; at least. See
https://developers.facebook.com/tools/debug/sharing/?q=http%3A%2F%2Fjuliandou...

+  <title>{{ title | translate("page-title", "Meta page title") }}</title>
+{% endif %}
+{% if description %}
+  <meta name="description" content="{{ description | translate("page-description", "Meta page description") }}">
+{% endif %}