docs: testing-components-basics.md and components-basics.md links to css selector documentation are dead
As MDN's documentation link to the "css selector" topic is dead, this commit makes the angular documentation use the new valid link.
PR Close#53586
The purpose of the changes is to clean all markdown to match a single pedantic style.
* To ensure all changes in style are properly separated.
* To ensure all styled content aligns to nearest 4-character-tab.
* To ensure all code blocks use the Angular `<code-example>` or `<code-tab>` elements.
* To ensure all markdown exists outside of html tags.
* To ensure all images use the Angular style for `<img>` elements.
* To ensure that all smart punctuation is replaced or removed.
```text
’, ’, “, ”, –, —, …
```
* To ensure all content does not conflict with the following reserved characters.
```text
@, $, *, &, #, |, <, >,
```
* To ensure all content displays using html entities.
The following changes were made to files in the following directory.
```text
aio/content
```
The target files were markdown files.
The list of excluded files:
```text
.browserslistrc, .css, .conf, .editorconfig, .gitignore, .html, .js, .json, .sh, .svg, .ts, .txt, .xlf,
```
PR Close#45325
Previously there was a custom version of the testing app for Stackblitz that would run the tests in the browser.
With the web-container approach, this is no longer necessary since the tests can be run directly from the command line.
Fixes#44047
PR Close#44085
We should primarily point readers to the stackblitz that contains the spec files and runs them.
The application stackblitz is secondary (and doesn't actually contain the spec files, which is confusing).
Fixes#38535
PR Close#42406
After the changes to the `lang-none` styling in #41335, code snippets marked with
```
language="none" class="code-shell"
```
were being styled with the same foreground and background colours.
It turns out that most of these ought to be marked `language="sh"`
in which case the `code-shell` style became redundant and has been
removed.
Fixes#41984
PR Close#41986
In #37957, parts of the testing guide were broken out into separate
guides. As part of that work, the `<live-example>` tags were also copied
to the new guides. These `<live-example>` tags did not specify the
targeted example project via the `name` attribute, thus they were
implicitly targeting the example with the same name as the guide they
were in. See the [Docs style guide][1] for more info.
However, there is only one example project (`testing/`) and all
`<live-example>` tags were supposed to target that. This worked fine on
the `testing.md` guide, but it broke on other guides (which tried to
target non-existing example projects based on their names).
This commit fixes it by explicitly specifying which example is targeted
by the `<live-example>` tags. It also removes the `embedded-style`
attribute that has no effect.
[1]: https://angular.io/guide/docs-style-guide#live-examplesFixes#38036
PR Close#38038
This commit breaks up the testing document into nine total documents, with each document focusing on an existing section of the current testing documentation. There are no content changes.
PR Close#37957
