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

Element: attributes property - Web APIs

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The Element.attributes property returns a live collection of all attribute nodes registered to the specified node. It is a NamedNodeMap, not an Array, so it has no Array methods and the Attr nodes' indexes may differ among browsers. To be more specific, attributes is a key/value pair of strings that represents any information regarding that attribute.

A NamedNodeMap object.

// Get the first <p> element in the document
const paragraph = document.querySelector("p");
const attributes = paragraph.attributes;

You can enumerate through an element's attributes using for...of. The following example runs through the attribute nodes for the element in the document with id "paragraph", and prints each attribute's value.

<p id="paragraph" class="green" contenteditable>Sample Paragraph</p>
<input type="button" value="Show paragraph attribute name and value" />
<pre id="result"></pre>

const paragraph = document.getElementById("paragraph");
const result = document.getElementById("result");
const btn = document.querySelector("input[type='button']");

btn.addEventListener("click", () => {
  // First, let's verify that the paragraph has some attributes
  if (paragraph.hasAttributes()) {
    let output = "Attributes of first paragraph:\n";
    for (const attr of paragraph.attributes) {
      output += `${attr.name} -> ${attr.value}\n`;
    }
    result.textContent = output;
  } else {
    result.textContent = "No attributes to show";
  }
});

• NamedNodeMap, the interface of the returned object
• Cross-browser compatibility considerations: on quirksmode

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