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HTML

              
                <body class="bg-gray-100" x-data="texts()">
  <template x-for="(text, index) in texts">
  <div class="container max-w-prose bg-white rounded shadow mx-auto my-6 p-6">
    <p class="text-lg text-gray-700 line-clamp-4" x-text="text" x-init="$nextTick(() => { setTruncate(index, $el) })">
    </p>

    <!-- dont show read more / read less if the text is not truncated -->
    <template x-if="truncatable[index]">
      <div>
        <button class="my-4 underline text-green-500" @click="event.target.parentNode.parentNode.querySelector('p').classList.remove('line-clamp-4'); truncated[index] = false;" x-show="truncated[index]">Read more...</button>

        <button class="my-4 underline text-green-500" @click="event.target.parentNode.parentNode.querySelector('p').classList.add('line-clamp-4'); truncated[index] = true;" x-show="!truncated[index]">Read less...</button>
      </div>
    </template>
  </div>
  </template>

  <script>
    function texts() {
      return {
        truncated: [false, false],
        truncatable: [false, false],
        texts: [
          "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec dapibus tempus lorem, sed fermentum libero. Aliquam mi arcu, euismod vel dictum faucibus, rutrum id purus. Donec tempor, enim non ullamcorper consectetur, lectus turpis placerat libero, nec laoreet magna quam nec magna. Vestibulum auctor molestie mauris et maximus. Sed maximus pretium pharetra. Maecenas rhoncus turpis viverra ipsum rhoncus, nec tincidunt augue consectetur. Nunc enim odio, sollicitudin id scelerisque id, tempor auctor lectus. Donec ut congue massa. Curabitur massa justo, rhoncus eget venenatis ac, tristique in urna. Sed ac dui nec nulla pellentesque rhoncus. Aenean a ornare lacus. Phasellus eu interdum neque. Curabitur tristique, velit quis tincidunt tempor, diam tortor feugiat risus, cursus elementum velit mi eu ex. Etiam mauris nibh, consequat vitae lectus id, tristique commodo urna. Vivamus nisi turpis, tempor id rhoncus in, facilisis nec odio. Duis condimentum suscipit leo, sed luctus magna malesuada nec. Duis quis molestie nisi, sit amet euismod dui. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Fusce elit neque, lobortis id dui non, tristique egestas urna. Suspendisse potenti. Sed fermentum eu eros ut varius. Praesent finibus quis nibh eu ultrices. Sed a eros tristique, euismod lorem lacinia, hendrerit ligula. In eget lacinia nisi. Praesent egestas, neque at ornare accumsan, tellus ex laoreet neque, eu tempor lorem ex vel ipsum.",
          "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec dapibus tempus lorem, sed fermentum libero. Aliquam mi arcu, euismod vel dictum faucibus, rutrum id purus.",
          "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec dapibus tempus lorem, sed fermentum libero. Aliquam mi arcu, euismod vel dictum faucibus, rutrum id purus. Donec tempor, enim non ullamcorper consectetur, lectus turpis placerat libero, nec laoreet magna quam nec magna. Vestibulum auctor molestie mauris et maximus. Sed maximus pretium pharetra. Maecenas rhoncus turpis viverra ipsum rhoncus, nec tincidunt augue consectetur. Nunc enim odio, sollicitudin id scelerisque id, tempor auctor lectus. Donec ut congue massa. Curabitur massa justo, rhoncus eget venenatis ac, tristique in urna. Sed ac dui nec nulla pellentesque rhoncus. Aenean a ornare lacus. Phasellus eu interdum neque. Curabitur tristique, velit quis tincidunt tempor, diam tortor feugiat risus, cursus elementum velit mi eu ex. Etiam mauris nibh, consequat vitae lectus id, tristique commodo urna. Vivamus nisi turpis, tempor id rhoncus in, facilisis nec odio. Duis condimentum suscipit leo, sed luctus magna malesuada nec. Duis quis molestie nisi, sit amet euismod dui. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Fusce elit neque, lobortis id dui non, tristique egestas urna. Suspendisse potenti. Sed fermentum eu eros ut varius. Praesent finibus quis nibh eu ultrices. Sed a eros tristique, euismod lorem lacinia, hendrerit ligula. In eget lacinia nisi. Praesent egestas, neque at ornare accumsan, tellus ex laoreet neque, eu tempor lorem ex vel ipsum."
        ],
        setTruncate(index, element) {
          if (element.offsetHeight < element.scrollHeight ||
              element.offsetWidth < element.scrollWidth) {
              // your element has an overflow
              // show read more button
              this.truncated[index] = true;
              this.truncatable[index] = true;
          } else {
              // your element doesn't have overflow
              this.truncated[index] = false;
              this.truncatable[index] = false;
          }
        } ,
        isTruncated(index) {
          return true;
        }
      }
    }
  </script>
</body>
              
            
!

CSS

              
                /*! tailwindcss v2.2.7 | MIT License | https://tailwindcss.com */

/*! modern-normalize v1.1.0 | MIT License | https://github.com/sindresorhus/modern-normalize */

/*
Document
========
*/

/**
Use a better box model (opinionated).
*/

*,
::before,
::after {
  box-sizing: border-box;
}

/**
Use a more readable tab size (opinionated).
*/

html {
  -moz-tab-size: 4;
  -o-tab-size: 4;
     tab-size: 4;
}

/**
1. Correct the line height in all browsers.
2. Prevent adjustments of font size after orientation changes in iOS.
*/

html {
  line-height: 1.15;
  /* 1 */
  -webkit-text-size-adjust: 100%;
  /* 2 */
}

/*
Sections
========
*/

/**
Remove the margin in all browsers.
*/

body {
  margin: 0;
}

/**
Improve consistency of default fonts in all browsers. (https://github.com/sindresorhus/modern-normalize/issues/3)
*/

body {
  font-family:
		system-ui,
		-apple-system, /* Firefox supports this but not yet `system-ui` */
		'Segoe UI',
		Roboto,
		Helvetica,
		Arial,
		sans-serif,
		'Apple Color Emoji',
		'Segoe UI Emoji';
}

/*
Grouping content
================
*/

/**
1. Add the correct height in Firefox.
2. Correct the inheritance of border color in Firefox. (https://bugzilla.mozilla.org/show_bug.cgi?id=190655)
*/

hr {
  height: 0;
  /* 1 */
  color: inherit;
  /* 2 */
}

/*
Text-level semantics
====================
*/

/**
Add the correct text decoration in Chrome, Edge, and Safari.
*/

abbr[title] {
  -webkit-text-decoration: underline dotted;
          text-decoration: underline dotted;
}

/**
Add the correct font weight in Edge and Safari.
*/

b,
strong {
  font-weight: bolder;
}

/**
1. Improve consistency of default fonts in all browsers. (https://github.com/sindresorhus/modern-normalize/issues/3)
2. Correct the odd 'em' font sizing in all browsers.
*/

code,
kbd,
samp,
pre {
  font-family:
		ui-monospace,
		SFMono-Regular,
		Consolas,
		'Liberation Mono',
		Menlo,
		monospace;
  /* 1 */
  font-size: 1em;
  /* 2 */
}

/**
Add the correct font size in all browsers.
*/

small {
  font-size: 80%;
}

/**
Prevent 'sub' and 'sup' elements from affecting the line height in all browsers.
*/

sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sub {
  bottom: -0.25em;
}

sup {
  top: -0.5em;
}

/*
Tabular data
============
*/

/**
1. Remove text indentation from table contents in Chrome and Safari. (https://bugs.chromium.org/p/chromium/issues/detail?id=999088, https://bugs.webkit.org/show_bug.cgi?id=201297)
2. Correct table border color inheritance in all Chrome and Safari. (https://bugs.chromium.org/p/chromium/issues/detail?id=935729, https://bugs.webkit.org/show_bug.cgi?id=195016)
*/

table {
  text-indent: 0;
  /* 1 */
  border-color: inherit;
  /* 2 */
}

/*
Forms
=====
*/

/**
1. Change the font styles in all browsers.
2. Remove the margin in Firefox and Safari.
*/

button,
input,
optgroup,
select,
textarea {
  font-family: inherit;
  /* 1 */
  font-size: 100%;
  /* 1 */
  line-height: 1.15;
  /* 1 */
  margin: 0;
  /* 2 */
}

/**
Remove the inheritance of text transform in Edge and Firefox.
1. Remove the inheritance of text transform in Firefox.
*/

button,
select {
  /* 1 */
  text-transform: none;
}

/**
Correct the inability to style clickable types in iOS and Safari.
*/

button {
  -webkit-appearance: button;
}

/**
Remove the inner border and padding in Firefox.
*/

/**
Restore the focus styles unset by the previous rule.
*/

/**
Remove the additional ':invalid' styles in Firefox.
See: https://github.com/mozilla/gecko-dev/blob/2f9eacd9d3d995c937b4251a5557d95d494c9be1/layout/style/res/forms.css#L728-L737
*/

/**
Remove the padding so developers are not caught out when they zero out 'fieldset' elements in all browsers.
*/

legend {
  padding: 0;
}

/**
Add the correct vertical alignment in Chrome and Firefox.
*/

progress {
  vertical-align: baseline;
}

/**
Correct the cursor style of increment and decrement buttons in Safari.
*/

/**
1. Correct the odd appearance in Chrome and Safari.
2. Correct the outline style in Safari.
*/

/**
Remove the inner padding in Chrome and Safari on macOS.
*/

/**
1. Correct the inability to style clickable types in iOS and Safari.
2. Change font properties to 'inherit' in Safari.
*/

/*
Interactive
===========
*/

/*
Add the correct display in Chrome and Safari.
*/

summary {
  display: list-item;
}

/**
 * Manually forked from SUIT CSS Base: https://github.com/suitcss/base
 * A thin layer on top of normalize.css that provides a starting point more
 * suitable for web applications.
 */

/**
 * Removes the default spacing and border for appropriate elements.
 */

blockquote,
dl,
dd,
h1,
h2,
h3,
h4,
h5,
h6,
hr,
figure,
p,
pre {
  margin: 0;
}

button {
  background-color: transparent;
  background-image: none;
}

fieldset {
  margin: 0;
  padding: 0;
}

ol,
ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

/**
 * Tailwind custom reset styles
 */

/**
 * 1. Use the user's configured `sans` font-family (with Tailwind's default
 *    sans-serif font stack as a fallback) as a sane default.
 * 2. Use Tailwind's default "normal" line-height so the user isn't forced
 *    to override it to ensure consistency even when using the default theme.
 */

html {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  /* 1 */
  line-height: 1.5;
  /* 2 */
}

/**
 * Inherit font-family and line-height from `html` so users can set them as
 * a class directly on the `html` element.
 */

body {
  font-family: inherit;
  line-height: inherit;
}

/**
 * 1. Prevent padding and border from affecting element width.
 *
 *    We used to set this in the html element and inherit from
 *    the parent element for everything else. This caused issues
 *    in shadow-dom-enhanced elements like <details> where the content
 *    is wrapped by a div with box-sizing set to `content-box`.
 *
 *    https://github.com/mozdevs/cssremedy/issues/4
 *
 *
 * 2. Allow adding a border to an element by just adding a border-width.
 *
 *    By default, the way the browser specifies that an element should have no
 *    border is by setting it's border-style to `none` in the user-agent
 *    stylesheet.
 *
 *    In order to easily add borders to elements by just setting the `border-width`
 *    property, we change the default border-style for all elements to `solid`, and
 *    use border-width to hide them instead. This way our `border` utilities only
 *    need to set the `border-width` property instead of the entire `border`
 *    shorthand, making our border utilities much more straightforward to compose.
 *
 *    https://github.com/tailwindcss/tailwindcss/pull/116
 */

*,
::before,
::after {
  box-sizing: border-box;
  /* 1 */
  border-width: 0;
  /* 2 */
  border-style: solid;
  /* 2 */
  border-color: currentColor;
  /* 2 */
}

/*
 * Ensure horizontal rules are visible by default
 */

hr {
  border-top-width: 1px;
}

/**
 * Undo the `border-style: none` reset that Normalize applies to images so that
 * our `border-{width}` utilities have the expected effect.
 *
 * The Normalize reset is unnecessary for us since we default the border-width
 * to 0 on all elements.
 *
 * https://github.com/tailwindcss/tailwindcss/issues/362
 */

img {
  border-style: solid;
}

textarea {
  resize: vertical;
}

input::-moz-placeholder, textarea::-moz-placeholder {
  opacity: 1;
  color: #9ca3af;
}

input:-ms-input-placeholder, textarea:-ms-input-placeholder {
  opacity: 1;
  color: #9ca3af;
}

input::placeholder,
textarea::placeholder {
  opacity: 1;
  color: #9ca3af;
}

button {
  cursor: pointer;
}

table {
  border-collapse: collapse;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-size: inherit;
  font-weight: inherit;
}

/**
 * Reset links to optimize for opt-in styling instead of
 * opt-out.
 */

a {
  color: inherit;
  text-decoration: inherit;
}

/**
 * Reset form element properties that are easy to forget to
 * style explicitly so you don't inadvertently introduce
 * styles that deviate from your design system. These styles
 * supplement a partial reset that is already applied by
 * normalize.css.
 */

button,
input,
optgroup,
select,
textarea {
  padding: 0;
  line-height: inherit;
  color: inherit;
}

/**
 * Use the configured 'mono' font family for elements that
 * are expected to be rendered with a monospace font, falling
 * back to the system monospace stack if there is no configured
 * 'mono' font family.
 */

pre,
code,
kbd,
samp {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/**
 * 1. Make replaced elements `display: block` by default as that's
 *    the behavior you want almost all of the time. Inspired by
 *    CSS Remedy, with `svg` added as well.
 *
 *    https://github.com/mozdevs/cssremedy/issues/14
 * 
 * 2. Add `vertical-align: middle` to align replaced elements more
 *    sensibly by default when overriding `display` by adding a
 *    utility like `inline`.
 *
 *    This can trigger a poorly considered linting error in some
 *    tools but is included by design.
 * 
 *    https://github.com/jensimmons/cssremedy/issues/14#issuecomment-634934210
 */

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  /* 1 */
  vertical-align: middle;
  /* 2 */
}

/**
 * Constrain images and videos to the parent width and preserve
 * their intrinsic aspect ratio.
 *
 * https://github.com/mozdevs/cssremedy/issues/14
 */

img,
video {
  max-width: 100%;
  height: auto;
}

/**
 * Ensure the default browser behavior of the `hidden` attribute.
 */

*, ::before, ::after {
  --tw-border-opacity: 1;
  border-color: rgba(229, 231, 235, var(--tw-border-opacity));
}

.container {
  width: 100%;
}

@media (min-width: 640px) {
  .container {
    max-width: 640px;
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 768px;
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 1024px;
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: 1280px;
  }
}

@media (min-width: 1536px) {
  .container {
    max-width: 1536px;
  }
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.my-4 {
  margin-top: 1rem;
  margin-bottom: 1rem;
}

.my-6 {
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
}

.table {
  display: table;
}

.max-w-prose {
  max-width: 65ch;
}

@-webkit-keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@-webkit-keyframes ping {
  75%, 100% {
    transform: scale(2);
    opacity: 0;
  }
}

@keyframes ping {
  75%, 100% {
    transform: scale(2);
    opacity: 0;
  }
}

@-webkit-keyframes pulse {
  50% {
    opacity: .5;
  }
}

@keyframes pulse {
  50% {
    opacity: .5;
  }
}

@-webkit-keyframes bounce {
  0%, 100% {
    transform: translateY(-25%);
    -webkit-animation-timing-function: cubic-bezier(0.8,0,1,1);
            animation-timing-function: cubic-bezier(0.8,0,1,1);
  }

  50% {
    transform: none;
    -webkit-animation-timing-function: cubic-bezier(0,0,0.2,1);
            animation-timing-function: cubic-bezier(0,0,0.2,1);
  }
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(-25%);
    -webkit-animation-timing-function: cubic-bezier(0.8,0,1,1);
            animation-timing-function: cubic-bezier(0.8,0,1,1);
  }

  50% {
    transform: none;
    -webkit-animation-timing-function: cubic-bezier(0,0,0.2,1);
            animation-timing-function: cubic-bezier(0,0,0.2,1);
  }
}

.rounded {
  border-radius: 0.25rem;
}

.bg-white {
  --tw-bg-opacity: 1;
  background-color: rgba(255, 255, 255, var(--tw-bg-opacity));
}

.bg-gray-100 {
  --tw-bg-opacity: 1;
  background-color: rgba(243, 244, 246, var(--tw-bg-opacity));
}

.p-6 {
  padding: 1.5rem;
}

.text-lg {
  font-size: 1.125rem;
  line-height: 1.75rem;
}

.text-gray-700 {
  --tw-text-opacity: 1;
  color: rgba(55, 65, 81, var(--tw-text-opacity));
}

.text-green-500 {
  --tw-text-opacity: 1;
  color: rgba(16, 185, 129, var(--tw-text-opacity));
}

.underline {
  text-decoration: underline;
}

*, ::before, ::after {
  --tw-shadow: 0 0 #0000;
}

.shadow {
  --tw-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  box-shadow: var(--tw-ring-offset-shadow, 0 0 #0000), var(--tw-ring-shadow, 0 0 #0000), var(--tw-shadow);
}

*, ::before, ::after {
  --tw-ring-inset: var(--tw-empty,/*!*/ /*!*/);
  --tw-ring-offset-width: 0px;
  --tw-ring-offset-color: #fff;
  --tw-ring-color: rgba(59, 130, 246, 0.5);
  --tw-ring-offset-shadow: 0 0 #0000;
  --tw-ring-shadow: 0 0 #0000;
}

.line-clamp-4 {
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
}

@media (min-width: 640px) {
}

@media (min-width: 768px) {
}

@media (min-width: 1024px) {
}

@media (min-width: 1280px) {
}

@media (min-width: 1536px) {
}
              
            
!

JS

              
                function texts() {
      return {
        truncated: [false, false],
        truncatable: [false, false],
        texts: [
          "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec dapibus tempus lorem, sed fermentum libero. Aliquam mi arcu, euismod vel dictum faucibus, rutrum id purus. Donec tempor, enim non ullamcorper consectetur, lectus turpis placerat libero, nec laoreet magna quam nec magna. Vestibulum auctor molestie mauris et maximus. Sed maximus pretium pharetra. Maecenas rhoncus turpis viverra ipsum rhoncus, nec tincidunt augue consectetur. Nunc enim odio, sollicitudin id scelerisque id, tempor auctor lectus. Donec ut congue massa. Curabitur massa justo, rhoncus eget venenatis ac, tristique in urna. Sed ac dui nec nulla pellentesque rhoncus. Aenean a ornare lacus. Phasellus eu interdum neque. Curabitur tristique, velit quis tincidunt tempor, diam tortor feugiat risus, cursus elementum velit mi eu ex. Etiam mauris nibh, consequat vitae lectus id, tristique commodo urna. Vivamus nisi turpis, tempor id rhoncus in, facilisis nec odio. Duis condimentum suscipit leo, sed luctus magna malesuada nec. Duis quis molestie nisi, sit amet euismod dui. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Fusce elit neque, lobortis id dui non, tristique egestas urna. Suspendisse potenti. Sed fermentum eu eros ut varius. Praesent finibus quis nibh eu ultrices. Sed a eros tristique, euismod lorem lacinia, hendrerit ligula. In eget lacinia nisi. Praesent egestas, neque at ornare accumsan, tellus ex laoreet neque, eu tempor lorem ex vel ipsum.",
          "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec dapibus tempus lorem, sed fermentum libero. Aliquam mi arcu, euismod vel dictum faucibus, rutrum id purus.",
          "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec dapibus tempus lorem, sed fermentum libero. Aliquam mi arcu, euismod vel dictum faucibus, rutrum id purus. Donec tempor, enim non ullamcorper consectetur, lectus turpis placerat libero, nec laoreet magna quam nec magna. Vestibulum auctor molestie mauris et maximus. Sed maximus pretium pharetra. Maecenas rhoncus turpis viverra ipsum rhoncus, nec tincidunt augue consectetur. Nunc enim odio, sollicitudin id scelerisque id, tempor auctor lectus. Donec ut congue massa. Curabitur massa justo, rhoncus eget venenatis ac, tristique in urna. Sed ac dui nec nulla pellentesque rhoncus. Aenean a ornare lacus. Phasellus eu interdum neque. Curabitur tristique, velit quis tincidunt tempor, diam tortor feugiat risus, cursus elementum velit mi eu ex. Etiam mauris nibh, consequat vitae lectus id, tristique commodo urna. Vivamus nisi turpis, tempor id rhoncus in, facilisis nec odio. Duis condimentum suscipit leo, sed luctus magna malesuada nec. Duis quis molestie nisi, sit amet euismod dui. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Fusce elit neque, lobortis id dui non, tristique egestas urna. Suspendisse potenti. Sed fermentum eu eros ut varius. Praesent finibus quis nibh eu ultrices. Sed a eros tristique, euismod lorem lacinia, hendrerit ligula. In eget lacinia nisi. Praesent egestas, neque at ornare accumsan, tellus ex laoreet neque, eu tempor lorem ex vel ipsum."
        ],
        setTruncate(index, element) {
          if (element.offsetHeight < element.scrollHeight ||
              element.offsetWidth < element.scrollWidth) {
              // your element has an overflow, ie. truncated
              // show read more button
              this.truncated[index] = true;
              this.truncatable[index] = true;
          } else {
              // your element doesn't have overflow
              this.truncated[index] = false;
              this.truncatable[index] = false;
          }
        } ,
        isTruncated(index) {
          return true;
        }
      }
    }
              
            
!
999px

Console