I rendered a smaller version and the upload went through. I think that it was caused by the filesize. Please fix the error-message and please consider raising the filesize-limit.

This seems to be related: T279407
Do I need to rerender to be able to upload it? I'm asking because the rendering (with Kdenlive) takes a lot of time and in that case the error-message should say so.

@Aklapper Please see (including the link):

In T258417#6606020, @Aklapper wrote:

In that case declining, as users are free to use the VisualEditor instead of the WikiEditor if they want to use the VisualEditor table editing implementation instead of the WikiEditor table editing implementation, and as this is not feasible at all to implement.

In that case it's about both but mainly about WikiEditor. I don't know why and how many are using the 2017 Wikitext editor. If it's not a default wikitext editor it would be far less important to add this functionality to this editor - I changed the task's tag.

In T258417#6605890, @Aklapper wrote:

Thanks for clarifying. Not dealing with WikiEditor in this task. Completely different codebase and a separate issue.

In T258417#6605795, @Aklapper wrote:

As requested before, please define what you think is "the default MediaWiki editor". See https://www.mediawiki.org/wiki/Editor

In T258417#6491402, @Aklapper wrote:

Unrelated to VE hence removing tag; though not clear which editor software this is about - see https://www.mediawiki.org/wiki/Editor for the list

Afaik this has been a substantial problem for quite a few articles already and will probably become an issue for many other articles in the near and mid-term future, so I really think this is something that should be worked on: especially as this seems to be a major factor in server-loads. I think the solution would be to rerender articles on the server-side once an included template gets changed and the serve the prerendered page. Are there any tasks related to this?

@Aklapper Thanks! This worked. I changed the content to also use the {{dts}} template in the 2nd article.
However, imo there still remain two (sub)issues:

@Ciencia_Al_Poder Thanks for the explanations.

In T262870#6462145, @Aklapper wrote:

2020-03-01 should already work according to the docs. Do you have a specific testcase / revision where it does not?

In T262848#6460638, @Aklapper wrote:

The HTML size itself is irrelevant. See the HTML source of your link: Post‐expand include size: 2097151/2097152 bytes.

@Aklapper Thanks, but this doesn't work. I tried with ! data-sort-type="date" | Launch Date in the table of "List of missions to Mars" linked above (sort descending). It also doesn't work with this table (it didn't sort at all and I already tried removing most rows so that all cells have the same datetime format of which I tried multiple).
Standard formats of datetimes, many of which can be found in many articles, which should all work with the sort-type (preferred ones highlighted):

@Pppery So this limit is there because of this?

I'm suggesting another long-term solution to this problem (T258382):

Thanks for the input and the related issue.
@TheDJ commented "4. Personally I do think that having some sort of 'make this table fullscreen' option is required. [...]" there.
I think my suggestion above would be the most effective implementation of such a fullscreen option in terms of eventual usefulness.
This fullscreen-rotate-screen option is already implemented in many apps including the YouTube app which rotates the screen for a fullscreen view.

In T258421#6321118, @Aklapper wrote:

There can be multiple categories/tags for every column and there could be many configurable and suggested filter-presets.

This. A sane frontend UI for that (plus not sure what's needed when it comes to backend storage).

In T258421#6321022, @Aklapper wrote:

To me this sounds like you could add an additional column with that "category", and then you are able to sort the table rows by that column value.

In T258421#6320949, @Aklapper wrote:

try to filter table-rows via tags in a tag-column.

@Prototyperspective: What would be a "category" or "tag" example on e.g. https://en.wikipedia.org/wiki/2020_in_science ?

In T258421#6320464, @Aklapper wrote:

Hi @Prototyperspective, thanks for taking the time to report this! What are clear steps to reproduce the situation? Which code base is this about? Please see and follow https://www.mediawiki.org/wiki/How_to_report_a_bug - thanks!