為什麼 HTML5 中的標題標籤內嵌套段落是一種有爭議的做法？

Nestling Paragraphs Within Heading Tags in HTML5: A Controversial Practice

HTML5's stringent validation standards forbid the inclusion of paragraph elements (

) within heading tags (). While this may seem like a rigid rule, there are underlying principles behind this restriction.

W3C Compliance and SEO Implications

The W3C mandates that heading tags should contain only "phrasing content," such as , , and . Embedding paragraphs within headings violates this requirement and can result in validation errors. Moreover, search engines may struggle to parse these nested structures, leading to potential SEO drawbacks.

Semantic Integrity

HTML5 strongly emphasizes semantic markup. Heading tags are designed to convey the structure and hierarchy of a document, while paragraph elements represent content blocks. Intermingling these elements can compromise the semantic integrity of the code.

Alternative Styling Techniques

If you need to apply different styles to portions of your heading text, you can leverage the element instead of

. By adding CSS styles to these spans, you can achieve the desired visual appearance while maintaining compliance with HTML5 standards. Here's an example:

<h1>
    <span class="major">Major part</span>
    <span class="minor">Minor part</span>
</h1>

h1 span {
    display: block;
}
h1 span.major {
    font-size: 50px;
    font-weight: bold;
}
h1 span.minor {
    font-size: 30px;
    font-style: italic;
}

Remember, semantic markup is paramount in HTML5. Avoid nesting paragraph elements within heading tags to ensure valid, crawlable, and well-structured code.

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