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the character encoding of the html document was not declared
The character encoding of the HTML document was not declared
The error message "The character encoding of the HTML document was not declared" indicates that the HTML document you're working with is missing a declaration for its character encoding. This declaration is important to ensure that the browser interprets the text and special characters correctly. To resolve this issue, you need to add the appropriate character encoding declaration to your HTML document. Here's how:

Add a Meta Tag in the head Section:
Open the HTML file you're working on and locate the head section. Add the following meta tag within the head section, preferably near the top of the document:

html

head
meta charset="UTF-8"
!-- Other meta tags, title, stylesheets, etc. --
/head

The charset="UTF-8" attribute indicates that the document is encoded using the UTF-8 character set, which supports a wide range of characters from different languages.

Save and Test:
Save the changes to your HTML file and then open it in a web browser. The character encoding declaration should ensure that the document is displayed correctly with the proper character interpretation.

Verify Consistency:
Make sure that the character encoding specified in the meta tag matches the actual encoding used in your HTML file. For example, if your HTML file is saved as UTF-8, use charset="UTF-8" in the meta tag.

Check Included Resources:
If your HTML document includes external resources like stylesheets or scripts, ensure that they also have the proper character encoding declaration.

Use Server-Side Configuration:
If you're working with a dynamic website, you can also set the character encoding at the server level using HTTP headers. Consult your server documentation or configuration to ensure that the proper character encoding is being sent in the HTTP response.

Content-Type Header:
If you have access to the server configuration, you can set the character encoding using the Content-Type header. For example, in PHP, you can add the following line at the beginning of your PHP file:

php

header('Content-Type: text/html; charset=UTF-8');

Adding the character encoding declaration ensures that your HTML document is correctly interpreted and displayed by web browsers, preventing issues related to character encoding mismatch.