I am curious about whether adding a list inside an H1 heading could cause any issues:
<h1>
<ul>
<li><a href="...">some link</a></li>
<li><a href="...">another link</a></li>
<li>current page</li>
</ul>
</h1>
The list serves as a "breadcrumb" type navigation.
Alternatively, would it be better to place the list inside the H1?
<ul>
<li><a href="...">some link</a></li>
<li><a href="...">another link</a></li>
<li><h1>current page</h1></li>
</ul>
According to the HTML specification, header elements such as <h1> must follow the phrasing content model. This means that phrasing content can only contain regular text or other phrasing content, making <ul> elements technically not allowed within <h1> elements.
On the other hand, nesting <h1> elements within <li> elements is considered valid markup and is actually the preferred way to combine <h1> and <ul> elements.
Attempting to nest a unordered list within a heading element is not considered valid according to HTML standards. A recommended method for verifying the validity of your code structure is by utilizing http://validator.w3.org/. This tool takes into account the specified doctype you are using. However, even with this validation process, the nesting of a ul inside a h1 remains invalid.
Feel free to utilize the W3C Markup Validation Service for validating your content!
In response to your initial inquiry, it seems that incorporating such a practice into your markup is not advisable in terms of best practices. Even if it were technically permissible (which I doubt), I would caution against implementing it.
Regarding SEO implications, the h1 tag does play a role in search rankings, although its importance may be overshadowed by the <title> element. However, forcibly inserting a heading for the purpose of boosting ranking when it doesn't naturally belong could negatively impact semantic structure. Instead, consider placing pertinent text in the <title> tag, organizing breadcrumb navigation appropriately, and omitting the h1 tag if unnecessary.
I believe displaying this as a list could be perceived as suboptimal, as lists are typically not used as headers. It would be more effective to utilize CSS styling to format the list according to your preferences in terms of size, font, and other style elements.
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