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wxiaoguang e7ef94e00f
Introduce customized HTML elements, fix incorrect AppUrl usages in templates (#22861)
This PR follows:
* #21986
* #22831

This PR also introduce customized HTML elements, which would also help
problems like:
* #17760
* #21429
* #21440

With customized HTML elements, there won't be any load-search-replace
operations, and it can avoid page flicking (which @silverwind cares a
lot).

Browser support:
https://developer.mozilla.org/en-US/docs/Web/API/Window/customElements

# FAQ

## Why the component has the prefix?

As usual, I would strongly suggest to add prefixes for our own/private
names. The dedicated prefix will avoid conflicts in the future, and it
makes it easier to introduce various 3rd components, like GitHub's
`relative-time` component. If there is no prefix, it's impossible to
introduce another public component with the same name in the future.

## Why the `custcomp.js` is loaded before HTML body? The `index.js` is
after HTML body.

Customized components must be registered before the content loading.
Otherwise there would be still some flicking.

`custcomp.js` should have its own dependencies and should be very light,
so it won't affect the page loading time too much.

## Why use `data-url` attribute but not use the `textContent`?

According to the standard, the `connectedCallback` occurs on the
tag-opening moment. The element's children are not ready yet.

## Why not use `{{.GuessCurrentOrigin $.ctx ...}}` to let backend decide
the absolute URL?

It's difficult for backend to guess the correct protocol(scheme)
correctly with zero configuration. Generating the absolute URL from
frontend can guarantee that the URL is 100% correct -- since the user is
visiting it.

# Screenshot

<details>

![image](https://user-images.githubusercontent.com/2114189/218256757-a267c8ba-3108-4755-9ae5-329f1b08f615.png)

</details>
1 year ago
..
actions Move helpers to be prefixed with `gt-` (#22879) 1 year ago
branch Move helpers to be prefixed with `gt-` (#22879) 1 year ago
cite Copy citation file content, in APA and BibTex format, on repo home page (#19999) 2 years ago
diff Always go full width in PR view (#22844) 1 year ago
editor Add context cache as a request level cache (#22294) 1 year ago
find Move helpers to be prefixed with `gt-` (#22879) 1 year ago
graph Add context cache as a request level cache (#22294) 1 year ago
issue Introduce customized HTML elements, fix incorrect AppUrl usages in templates (#22861) 1 year ago
migrate Add context cache as a request level cache (#22294) 1 year ago
projects Add context cache as a request level cache (#22294) 1 year ago
pulls Always go full width in PR view (#22844) 1 year ago
release Add context cache as a request level cache (#22294) 1 year ago
settings Fix 404 error viewing the LFS file (#22945) 1 year ago
wiki Move helpers to be prefixed with `gt-` (#22879) 1 year ago
activity.tmpl Add main landmark to templates and adjust titles (#22670) 1 year ago
blame.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
branch_dropdown.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
clone_buttons.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
clone_script.tmpl Make clone URL use current page's host (#22808) 1 year ago
commit_page.tmpl Always go full width in PR view (#22844) 1 year ago
commit_status.tmpl Change commit status icons to SVG (#20736) 2 years ago
commit_statuses.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
commits.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
commits_list.tmpl Add context cache as a request level cache (#22294) 1 year ago
commits_list_small.tmpl Add context cache as a request level cache (#22294) 1 year ago
commits_table.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
create.tmpl Add context cache as a request level cache (#22294) 1 year ago
create_helper.tmpl Add templates to customize text when creating and migrating repositories 1 year ago
empty.tmpl Add main landmark to templates and adjust titles (#22670) 1 year ago
file_info.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
forks.tmpl Add context cache as a request level cache (#22294) 1 year ago
graph.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
header.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
home.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
icon.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
packages.tmpl Add main landmark to templates and adjust titles (#22670) 1 year ago
search.tmpl Remove Fomantic-UI's `.hidden` CSS class for menu elements (#22895) 1 year ago
shabox_badge.tmpl Fix shabox regression (#22924) 1 year ago
sub_menu.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
unicode_escape_prompt.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
upload.tmpl Refactor `i18n` to `locale` (#20153) 2 years ago
user_cards.tmpl Add context cache as a request level cache (#22294) 1 year ago
view_file.tmpl Move helpers to be prefixed with `gt-` (#22879) 1 year ago
view_list.tmpl Introduce customized HTML elements, fix incorrect AppUrl usages in templates (#22861) 1 year ago
watchers.tmpl Add main landmark to templates and adjust titles (#22670) 1 year ago