add Htmx 1.9.1

Author: rbri

src/test/resources/libraries/htmx/htmx-1.9.1/README.md

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+[![</> htmx](https://raw.githubusercontent.com/bigskysoftware/htmx/master/www/static/img/htmx_logo.1.png "high power tools for HTML")](https://htmx.org)
+
+*high power tools for HTML*
+
+[![Discord](https://img.shields.io/discord/725789699527933952)](https://htmx.org/discord)
+[![Netlify](https://img.shields.io/netlify/dba3fc85-d9c9-476a-a35a-e52a632cef78)](https://app.netlify.com/sites/htmx/deploys)
+[![Bundlephobia](https://badgen.net/bundlephobia/dependency-count/htmx.org)](https://bundlephobia.com/result?p=htmx.org)
+[![Bundlephobia](https://badgen.net/bundlephobia/minzip/htmx.org)](https://bundlephobia.com/result?p=htmx.org)
+
+## introduction
+
+htmx allows you to access  [AJAX](https://htmx.org/docs#ajax), [CSS Transitions](https://htmx.org/docs#css_transitions),
+[WebSockets](https://htmx.org/docs#websockets) and [Server Sent Events](https://htmx.org/docs#sse) 
+directly in HTML, using [attributes](https://htmx.org/reference#attributes), so you can build 
+[modern user interfaces](https://htmx.org/examples) with the [simplicity](https://en.wikipedia.org/wiki/HATEOAS) and 
+[power](https://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm) of hypertext
+
+htmx is small ([~14k min.gz'd](https://unpkg.com/htmx.org/dist/)), 
+[dependency-free](https://github.com/bigskysoftware/htmx/blob/master/package.json),
+[extendable](https://htmx.org/extensions) & 
+IE11 compatible
+
+## motivation
+
+* Why should only `<a>` and `<form>` be able to make HTTP requests?
+* Why should only `click` & `submit` events trigger them?
+* Why should only GET & POST be available?
+* Why should you only be able to replace the *entire* screen?
+
+By removing these arbitrary constraints htmx completes HTML as a 
+[hypertext](https://en.wikipedia.org/wiki/Hypertext)
+
+## quick start
+
+```html
+  <script src="https://unpkg.com/htmx.org@1.9.1"></script>
+  <!-- have a button POST a click via AJAX -->
+  <button hx-post="/clicked" hx-swap="outerHTML">
+    Click Me
+  </button>
+```
+
+The [`hx-post`](https://htmx.org/attributes/hx-post) and [`hx-swap`](https://htmx.org/attributes/hx-swap) attributes tell htmx:
+
+> "When a user clicks on this button, issue an AJAX request to /clicked, and replace the entire button with the response"
+
+htmx is the successor to [intercooler.js](http://intercoolerjs.org)
+
+### installing as a node package
+
+To install using npm:
+
+```
+npm install htmx.org --save
+```
+
+Note there is an old broken package called `htmx`.  This is `htmx.org`.
+
+## website & docs
+
+* <https://htmx.org>
+* <https://htmx.org/docs>
+
+## contributing
+
+* please write code, including tests, in ES5 for [IE 11 compatibility](https://stackoverflow.com/questions/39902809/support-for-es6-in-internet-explorer-11)
+* please include test cases in [`/test`](https://github.com/bigskysoftware/htmx/tree/dev/test) and docs in [`/www`](https://github.com/bigskysoftware/htmx/tree/dev/www)
+* if you are adding a feature, consider doing it as an [extension](https://htmx.org/extensions) instead to
+  keep the core htmx code tidy
+* development pull requests should be against the `dev` branch, docs fixes can be made directly against `master`
+* No time? Then [become a sponsor](https://github.com/sponsors/bigskysoftware#sponsors)
+
+### hacking guide
+
+To develop htmx locally, you will need to install the development dependencies.
+
+__Requires Node 15.__
+
+Run:
+
+```
+npm install
+```
+
+Then, run a web server in the root.
+
+This is easiest with:
+
+```
+npx serve
+```
+
+You can then run the test suite by navigating to:
+
+<http://0.0.0.0:3000/test/>
+
+At this point you can modify `/src/htmx.js` to add features, and then add tests in the appropriate area under `/test`.
+
+* `/test/index.html` - the root test page from which all other tests are included
+* `/test/attributes` - attribute specific tests
+* `/test/core` - core functionality tests
+* `/test/core/regressions.js` - regression tests
+* `/test/ext` - extension tests
+* `/test/manual` - manual tests that cannot be automated
+
+htmx uses the [mocha](https://mochajs.org/) testing framework, the [chai](https://www.chaijs.com/) assertion framework 
+and [sinon](https://sinonjs.org/releases/v9/fake-xhr-and-server/) to mock out AJAX requests.  They are all OK.
+
+## haiku
+
+*javascript fatigue:<br/>
+longing for a hypertext<br/>
+already in hand*