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HTML

              
                <!-- Symbol used for the inline version so you don't have to repeat this every time -->
<svg class="symbols" fill="none" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <symbol id="swirl" width="21" height="25" viewBox="0 0 21 25" preserveAspectRatio="xMidYMax" fill="none">
			<path d="M16 21.5C16 19.25 16 18.6 16 15C16 7 11.75 3 7.5 3C3.2503 3 2 6.5 2 8C2 9.5 3.2503 13 7.5 13C10.5 13 16 12 16 2V0" stroke="currentColor" stroke-width="2" stroke-linecap="round"/>
		</symbol>
  </defs>
</svg>

<h1>Responsive SVG Connectors</h1>
<p class="intro">You can edit the text inside the paragraphs to see the connecting line grow and shrink.</p>
<div class="wrapper">
  <h2>Inline SVG</h2>
  <div class="post">
    <div class="post__avatar">
      <img src='https://assets.codepen.io/963316/Rudolph+Reindeer+Avatar.png' alt='Avatar Rudolph'>
    </div>
    <div class="post__content">
      <p contenteditable="true">Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam quasi totam neque incidunt quis commodi assumenda quas repudiandae, repellendus cum laudantium eveniet, similique sint ipsa mollitia! Facere veniam est doloribus.</p>
      <p contenteditable="true">Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam quasi totam neque incidunt quis commodi assumenda quas repudiandae.</p>
    </div>
    <svg class="post__connector | swirl-line" width="21" height="36" fill="none" xmlns="http://www.w3.org/2000/svg">
      <use class="swirl-line__swirl" href="#swirl" x="0" y="0" width="21" height="100%" />
      <rect class="swirl-line__line" x="15" y="0" width="2" height="100%" rx="1" fill="currentColor"/>
    </svg>
  </div>
  <div class="post">
    <div class="post__avatar">
      <img src='https://assets.codepen.io/963316/DALL%C2%B7E+Santa+Claus+Avatar.png' alt='Avatar Santa'>
    </div>
    <div class="post__content">
      <p contenteditable="true">Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam quasi totam neque incidunt quis commodi assumenda quas repudiandae, repellendus cum laudantium eveniet, similique sint ipsa mollitia! Facere veniam est doloribus.</p>
    </div>
  </div>
  
  <h2>Image Tag</h2>
  <div class="post">
    <div class="post__avatar">
      <img src='https://assets.codepen.io/963316/Rudolph+Reindeer+Avatar.png' alt='Avatar Rudulph'>
    </div>
    <div class="post__content">
      <p contenteditable="true">Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam quasi totam neque incidunt quis commodi assumenda quas repudiandae, repellendus cum laudantium eveniet, similique sint ipsa mollitia! Facere veniam est doloribus.</p>
      <p contenteditable="true">Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam quasi totam neque incidunt quis commodi assumenda quas repudiandae.</p>
    </div>
    <img class="post__connector" width="21" height="80" src="https://assets.codepen.io/963316/swirlline.svg" alt="" />
  </div>
  <div class="post">
    <div class="post__avatar">
      <img src='https://assets.codepen.io/963316/DALL%C2%B7E+Santa+Claus+Avatar.png' alt='Avatar Santa'>
    </div>
    <div class="post__content">
      <p contenteditable="true">Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam quasi totam neque incidunt quis commodi assumenda quas repudiandae, repellendus cum laudantium eveniet, similique sint ipsa mollitia! Facere veniam est doloribus.</p>
    </div>
  </div>
  
  <h2>URI encoded SVG background-image</h2>
  <div class="post post--reply-connection">
    <div class="post__avatar">
      <img src='https://assets.codepen.io/963316/Rudolph+Reindeer+Avatar.png' alt='Avatar Rudolph'>
    </div>
    <div class="post__content">
      <p contenteditable="true">Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam quasi totam neque incidunt quis commodi assumenda quas repudiandae, repellendus cum laudantium eveniet, similique sint ipsa mollitia! Facere veniam est doloribus.</p>
      <p contenteditable="true">Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam quasi totam neque incidunt quis commodi assumenda quas repudiandae.</p>
    </div>
  </div>
  <div class="post">
    <div class="post__avatar">
      <img src='https://assets.codepen.io/963316/DALL%C2%B7E+Santa+Claus+Avatar.png' alt='Avatar Santa'>
    </div>
    <div class="post__content">
      <p contenteditable="true">Lorem ipsum dolor sit amet consectetur adipisicing elit. Veniam quasi totam neque incidunt quis commodi assumenda quas repudiandae, repellendus cum laudantium eveniet, similique sint ipsa mollitia! Facere veniam est doloribus.</p>
    </div>
  </div>  
</div>

<!-- SVG used for the background-image. Inline background encoder: https://yoksel.github.io/url-encoder/ -->

<!--
<svg fill="none" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <symbol id="swirl" width="21" height="25" viewBox="0 0 21 25" preserveAspectRatio="xMidYMax" fill="none">
			<path d="M16 21.5C16 19.25 16 18.6 16 15C16 7 11.75 3 7.5 3C3.2503 3 2 6.5 2 8C2 9.5 3.2503 13 7.5 13C10.5 13 16 12 16 2V0" stroke="#666691" stroke-width="2" stroke-linecap="round"/>
		</symbol>
    <style>
      .line {
        height: calc(100% - 24px);
      }
    </style>
  </defs>
  <use class="swirl" href="#swirl" x="0" y="0" width="21" height="100%" />
  <rect class="line" x="15" y="0" width="2" rx="1" height="100%" fill="#666691"/>
</svg>
-->
              
            
!

CSS

              
                
/* CSS for inline SVG version */
.swirl-line {
  &__line {
    height: calc(100% - 24px);
  }
}

/* General Post Styling */
.post {
  margin-inline: auto;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto 1fr;
  gap: 1rem 1rem;
  border-radius: 0.5rem;
  
  &__avatar {
    width: 2.25rem;
    aspect-ratio: 1;
    margin-block-start: 0.5rem;
   
    img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 100%;
    }
  }
  
  &__content {
    grid-row: 1 / 3;
    grid-column: 2;
    padding-block-end: 2rem;
    
    > * + * {
      margin-block-start: 1rem;
    }
  }
  
  /* Styles for the inline SVG and the <img> */
  &__connector {
    grid-column: 1;
    grid-row: 2;
    width: 21px;
    height: 100%;
    color: #666691;
  }
}

/* Pseudo element with swirl background image */
.post--reply-connection:after {
  content: "";
  grid-column: 1;
  grid-row: 2;
  background-image: url("data:image/svg+xml,%3Csvg fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Csymbol id='swirl' width='21' height='25' viewBox='0 0 21 25' preserveAspectRatio='xMidYMax' fill='none'%3E%3Cpath d='M16 21.5C16 19.25 16 18.6 16 15C16 7 11.75 3 7.5 3C3.2503 3 2 6.5 2 8C2 9.5 3.2503 13 7.5 13C10.5 13 16 12 16 2V0' stroke='%23666691' stroke-width='2' stroke-linecap='round'/%3E%3C/symbol%3E%3Cstyle%3E .line %7B height: calc(100%25 - 24px); %7D %3C/style%3E%3C/defs%3E%3Cuse class='swirl' href='%23swirl' x='0' y='0' width='21' height='100%25' /%3E%3Crect class='line' x='15' y='0' width='2' rx='1' height='100%25' fill='%23666691'/%3E%3C/svg%3E");
  background-size: 21px 100%;
  background-repeat: no-repeat;
  background-position: 0 0;
}

.symbols {
  position: absolute;
  visibility: hidden;
  overflow: hidden;
  width: 1px;
  height: 1px;
}

.wrapper {
  width: min(100% - 4rem, 38rem);
  padding-block: 2rem;
  margin-inline: auto;
  
  > * + * {
    margin-block-start: 0.5rem;
  }
}


/* Some basic reset styles */
@layer reset {
  *,
  *:before,
  *:after {
    box-sizing: border-box;
  }

  body {
    background: linear-gradient(45deg, #003, hsl(220,80%,20%));
    background: hsl(220,80%,20%);
    color: #fff;
    min-height: 100vh;
    min-height: 100dvh;
    line-height: 1.5;
    font-family: "Redacted Script", cursive;
  }

  h1, h2 {
    font-family: 'Iowan Old Style', 'Palatino Linotype', 'URW Palladio L', P052, serif;
    text-align: center;
    line-height: 1.3;
  }
  
  p.intro {
    font-family: 'Iowan Old Style', 'Palatino Linotype', 'URW Palladio L', P052, serif;
    text-align: center;
    line-height: 1.5;
    font-size: 1.125rem;
    max-width: min(100% - 2rem, 50ch);
    margin-inline: auto;
  }

  h1,
  h2,
  h3,
  h4,
  p,
  ul,
  li {
    margin: 0;
    padding: 0;
  }

  img,
  svg {
    display: block;
  }
}




              
            
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