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# HTML <keygen> disabled Attribute The `` element was introduced in HTML5 to facilitate the generation of key pairs for client certificates. The `disabled` attribute is a boolean attribute used to disable the `` element, preventing user interaction and excluding its value from form submission. > **Important Deprecation Notice:** The `` element has been deprecated and removed from the HTML standard. Modern web applications should use the **Web Cryptography API (Web Crypto API)** for cryptographic key generation and management. This tutorial is provided for legacy system maintenance and historical reference. --- ## Definition and Usage The `disabled` attribute is a boolean attribute. When present, it specifies that the `` element should be disabled. A disabled `` element is: * **Unusable and unclickable:** Users cannot interact with the dropdown menu to select key strengths. * **Excluded from form submission:** The browser will not submit the public key generated by this element when the form is sent to the server. This attribute is typically used in dynamic forms where the key generation field should only become active after the user meets certain conditions (e.g., checking a "Consent" checkbox or selecting a specific login method). Developers can use JavaScript to remove the `disabled` attribute and make the element active. --- ## Syntax In standard HTML, you can write the attribute as a minimized boolean: ```html ``` ### HTML vs. XHTML Differences In XHTML, attribute minimization is forbidden. The `disabled` attribute must be explicitly defined with its value: ```xhtml ``` --- ## Code Example Below is an example of a form containing a disabled `` element: ```html

Username:

Encryption:

``` --- ## Browser Compatibility Historically, the `disabled` attribute of the `` element was supported by the following browsers: * **Google Chrome** (Early versions) * **Mozilla Firefox** (Early versions) * **Opera** (Early versions) * **Safari 6** and later * **Internet Explorer:** Never supported the `` tag. *Note: Because the `` tag itself has been deprecated and removed from modern browser engines (including Chromium, Gecko, and WebKit), this attribute will no longer function in up-to-date web browsers.* --- ## Modern Alternative: Web Cryptography API If you are building a modern web application that requires client-side key generation, do not use the `` tag. Instead, use the standard **Web Crypto API** (`crypto.subtle.generateKey`). Here is a modern JavaScript alternative to generate a cryptographic key pair: ```javascript // Generate an RSA-OAEP key pair using the Web Crypto API window.crypto.subtle.generateKey( { name: "RSA-OAEP", modulusLength: 2048, publicExponent: new Uint8Array([1, 0, 1]), hash: "SHA-256" }, true, // Whether the key is extractable ["encrypt", "decrypt"] // Key usages ) .then((keyPair) => { console.log("Key pair generated successfully:", keyPair); }) .catch((err) => { console.error("Key generation failed:", err); }); ```