What could be the reason for the unexpected behavior of position sticky?

I am encountering an issue while trying to figure out why the container__item--special element behaves as a sticky element in this code snippet

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <style>
            .container {
                display: flex;
                overflow-x: auto;
                position: relative;
            }

            .container__item {
                width: 200px;
                height: 50px;
                border: 1px solid;
                flex-shrink: 0;
            }

            .container__item--special {
                position: sticky;
                left: 0; 
                background-color: red;
            }

        </style>
    </head>
    <body>
        <div class="container">
            <div class="container__item"></div>
            <div class="container__item"></div>
            <div class="container__item container__item--special"></div>
            <div class="container__item"></div>
            <div class="container__item"></div>
            <div class="container__item"></div>
            <div class="container__item"></div>
        </div>
    </body>
</html>

However, in this other section it does not exhibit the same behavior

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <style>
            .container {
                display: flex;
                flex-direction: column;
                overflow-x: auto;
                position: relative;
            }

            .sub-container {
                display: flex;
            }

            .container__item {
                width: 200px;
                height: 50px;
                border: 1px solid;
                flex-shrink: 0;
            }

            .container__item--special {
                position: sticky;
                left: 0; 
                background-color: red;
            }

        </style>
    </head>
    <body>
        <div class="container">
            <div class="sub-container">
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item container__item--special"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
            </div>
            <div class="sub-container">
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
            </div>
        </div>
    </body>
</html>

htmlcsscss-position

Answer №1

To better understand what is happening, add a border to the parent element:

.container {
  display: flex;
  flex-direction: column;
  overflow-x: auto;
  position: relative;
}

.sub-container {
  display: flex;
  border: 2px solid green;
}

.container__item {
  width: 200px;
  height: 50px;
  border: 1px solid;
  flex-shrink: 0;
}

.container__item--special {
  position: sticky;
  left: 0;
  background-color: red;
}
<div class="container">
  <div class="sub-container">
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item container__item--special"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
  </div>
  <div class="sub-container">
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
  </div>
</div>

The limited space for the sticky behavior occurs because the parent element is restricted to its parent's width by default due to the stretching alignment setting. By disabling it, the behavior can be adjusted as desired.

.container {
  display: flex;
  flex-direction: column;
  overflow-x: auto;
  position: relative;
}

.sub-container {
  display: flex;
  align-self: start; /* added */
  border: 2px solid green;
}

.container__item {
  width: 200px;
  height: 50px;
  border: 1px solid;
  flex-shrink: 0;
}

.container__item--special {
  position: sticky;
  left: 0;
  background-color: red;
}
<div class="container">
  <div class="sub-container">
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item container__item--special"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
  </div>
  <div class="sub-container">
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
    <div class="container__item"></div>
  </div>
</div>

Answer №2

Kindly review the revised code below, focusing on adjusting only the CSS properties in the "sub-container" and "container" classes. Simply incorporate the CSS from the "container" class into the "sub-container" class.

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <style>
          .container {
              display: flex;
              flex-direction: column;
          }
          .sub-container {
              display: flex;
              overflow-x: auto;
              position: relative;
          }

          .container__item {
              width: 200px;
              height: 50px;
              border: 1px solid;
              flex-shrink: 0;
          }

          .container__item--special {
              position: sticky;
              left: 0; 
              background-color: red;
          }
        </style>
    </head>
    <body>
         <div class="container">
             <div class="sub-container">
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item container__item--special"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
            </div>
            <div class="sub-container">
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
                <div class="container__item"></div>
            </div>
        </div>
    </body>
</html>

Please provide feedback if this meets your requirements. Thank you.

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