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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Element/slot below:

Element: slot property - Web APIs

Element: slot property

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The slot property of the Element interface returns the name of the shadow DOM slot the element is inserted in.

A slot is a placeholder inside a web component that users can fill with their own markup (see Using templates and slots for more information).

Value

A string.

Examples

In our simple-template example (see it live), we create a trivial custom element example called <my-paragraph> in which a shadow root is attached and then populated using the contents of a template that contains a slot named my-text.

When <my-paragraph> is used in the document, the slot is populated by a slottable element by including it inside the element with a slot attribute with the value my-text. Here is one such example:

<my-paragraph>
  <span slot="my-text">Let's have some different text!</span>
</my-paragraph>

In our JavaScript file we get a reference to the <span> shown above, then log a reference to the name of the corresponding <slot> element.

let slottedSpan = document.querySelector("my-paragraph span");
console.log(slottedSpan.slot); // logs 'my-text'
Specifications Browser compatibility

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