## Architectural Considerations

### Pilot Tests

- **Component Focus**: Primarily focuses on the Pilot component and its interactions with Envoy proxies.
- **Setup Requirements**: Requires the Istio control plane to be initialized with Pilot.

### Ambient Tests

- **Component Focus**: Primarily focuses on Ambient mode components, including `ztunnel`.

[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{padding:0;border-style:none}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}textarea{overflow:auto;resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{dis...

{!> ../../docs_src/dependencies/tutorial005.py!}
```

////

It declares an optional query parameter `q` as a `str`, and then it just returns it.

This is quite simple (not very useful), but will help us focus on how the sub-dependencies work.

## Second dependency, "dependable" and "dependant"

text-align: left; // 3\n  background-color: $body-bg; // 2\n}\n\n// Future-proof rule: in browsers that support :focus-visible, suppress the focus outline\n// on elements that programmatically receive focus but wouldn't normally show a visible\n// focus outline. In general, this would mean that the outline is only applied if the\n// interaction that led to the element receiving programmatic focus was a keyboard interaction,\n// or the browser has somehow determined that the user is primarily a keyboard...

ssList.contains("disabled")))return void t.preventDefault();"INPUT"!==n.tagName&&"LABEL"===e.tagName||E._jQueryInterface.call(o.default(e),"toggle","INPUT"===n.tagName)}})).on("focus.bs.button.data-api blur.bs.button.data-api",v,(function(t){var e=o.default(t.target).closest(b)[0];o.default(e).toggleClass("focus",/^focus(in)?$/.test(t.type))})),o.default(window).on("load.bs.button.data-api",(function(){for(var t=[].slice.call(document.querySelectorAll('[data-toggle="buttons"] .btn')),e=0,n=t.length;e<n;e++){var...

against a dark gray background.\n@mixin form-control-focus($ignore-warning: false) {\n  &:focus {\n    color: $input-focus-color;\n    background-color: $input-focus-bg;\n    border-color: $input-focus-border-color;\n    outline: 0;\n    @if $enable-shadows {\n      @include box-shadow($input-box-shadow, $input-focus-box-shadow);\n    } @else {\n      // Avoid using mixin so we can pass custom focus shadow properly\n      box-shadow: $input-focus-box-shadow;\n    }\n  }\n  @include deprecate(\"The...

urn 38==e.keyCode?(e.preventDefault(),void n.default(ft).children().last().focus()):40==e.keyCode?(e.preventDefault(),void n.default(ft).children().first().focus()):void setTimeout((function(){ht._jQueryInterface.call(n.default(ot),"search")}),100)})),n.default(document).on("keydown",ft,(function(e){var t=n.default(":focus");38==e.keyCode&&(e.preventDefault(),t.is(":first-child")?t.siblings().last().focus():t.prev().focus()),40==e.keyCode&&(e.preventDefault(),t.is(":last-child")?t.siblings().fir...

## First Steps

Let's see a very simple example. It will be so simple that it is not very useful, for now.

But this way we can focus on how the **Dependency Injection** system works.

### Create a dependency, or "dependable"

Let's first focus on the dependency.

It is just a function that can take all the same parameters that a *path operation function* can take:

 * an expressive source hint for the model problem. Instead, the source hint is configured by the model builder before
 * it delegates to other components that potentially encounter problems. Then, the problem reporter can focus on
 * providing a simple error message, leaving the donkey work of creating a nice model problem to this component.
 *
 * @deprecated use {@link org.apache.maven.api.services.ModelBuilder} instead
 */

[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{padding:0;border-style:none}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}textarea{overflow:auto;resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{dis...