Why is it important to validate HTML code and how can this be done effectively?

It is important to validate HTML code to ensure that it is structured correctly and follows the standards set by the W3C. This can help improve website performance, accessibility, and search engine optimization. Validation can be done effectively by using online tools such as the W3C Markup Validation Service or by integrating validation checks into the development process. 

$html = "<!DOCTYPE html><html><head><title>Example</title></head><body><h1>Hello, world!</h1></body></html>";
$validator = new W3CValidator();
$isValid = $validator->validate($html);

if($isValid) {
    echo "HTML code is valid.";
} else {
    echo "HTML code is not valid.";
}

Keywords

HTML validation importance effective validation methods PHP functions error types

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