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css.at-rules.starting-style - Safari only applies rule on load and not on new elements added to the DOM #25643

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eli-fusionary opened this issue Jan 13, 2025 · 0 comments
Open

css.at-rules.starting-style - Safari only applies rule on load and not on new elements added to the DOM #25643

eli-fusionary opened this issue Jan 13, 2025 · 0 comments
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data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS

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@eli-fusionary
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eli-fusionary commented Jan 13, 2025 •
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What type of issue is this?

Browser bug (a bug with a feature that may impact site compatibility)

What information was incorrect, unhelpful, or incomplete?

Safari is reported to support this but I do not believe it does.

What browsers does this problem apply to, if applicable?

Safari (I am using 17.6)

What did you expect to see?

When I added a square to the DOM, it should have applied the @starting-styles. It did not. It did apply them on load, but not on add.

Did you test this? If so, how?

I tested it by running this code through Live Server within Safari and Chrome. You will want to pull it up then navigate to the /transitions page. This is part of a course I am taking on Udemy.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

No, I think Safari is probably a private repo. Here is the MDN page though: https://developer.mozilla.org/en-US/docs/Web/CSS/@starting-style

Do you have anything more you want to share?

.square {
  width: 100px;
  height: 100px;
  background-image: linear-gradient(purple, yellow);
  transition: display 0.5s allow-discrete, opacity 0.5s, transform 0.5s;
}

@starting-style {
  .square {
    opacity: 0;
    transform: scale(0);
  }
}

.square.hide {
  display: none;
  opacity: 0;
}
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Transitions</title>
    <link rel="stylesheet" href="styles.css" />
    <script>
      document.addEventListener("DOMContentLoaded", () => {
        const element = document.querySelector(".square");
        const addButton = document.querySelector(".add-square");

        addButton.addEventListener("click", () => {
          const newSquare = document.createElement("div");
          newSquare.classList.add("square");
          document.querySelector(".wrapper").appendChild(newSquare);
        });
      });
    </script>
  </head>
  <body>
    <div class="wrapper">
      <div class="square"></div>
    </div>
    <button class="add-square">Add Square</button>
  </body>
</html>
starting-styles-safari-chrome.mov

MDN URL

https://developer.mozilla.org/en-US/docs/Web/CSS/@starting-style

MDN metadata

MDN page report details
  • Query: css.at-rules.starting-style
  • Report started: 2025-01-13T18:37:06.489Z
@github-actions github-actions bot added the data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS label Jan 13, 2025
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