图中的块引用：何时使用页脚，何时使用 figcaption？

Question

w3.org's blockquote-page上有两个例子：

<figure>
    <blockquote>
        "That monster custom, who all sense doth eat
        Of habit’s devil," <abbr title="et cetera">&c.</abbr> not in Folio

        "What a falling off was there !
        From me, whose love was of that dignity
        That it went hand in hand even with the vow
        I made to her in marriage, and to decline
        Upon a wretch."
    </blockquote>

    <footer>
        — <cite class="title">Shakespeare manual</cite>
        by <cite class="author">Frederick Gard Fleay</cite>,
        p19 (in Google Books)
    </footer>
</figure>

Example 19:

<figure>
    <blockquote>
        <p>
            The truth may be puzzling. It may take some work to grapple with.
            It may be counterintuitive. It may contradict deeply held
            prejudices. It may not be consonant with what we desperately want to
            be true. But our preferences do not determine what’s true. We have a
            method, and that method helps us to reach not absolute truth, only
            asymptotic approaches to the truth — never there, just closer
            and closer, always finding vast new oceans of undiscovered
            possibilities. Cleverly designed experiments are the key.
        </p>
    </blockquote>

    <figcaption>
        <cite>Carl Sagan</cite>,
        in "<cite>Wonder and Skepticism</cite>",
        from the <cite>Skeptical Inquirer</cite> Volume 19, Issue 1 (January-February 1995)
    </figcaption>
</figure>

两者在内容方面看起来都与我非常相似。但是他们说关于第一个:

Note
In the example above, the citation is contained within the footer of a figure element, this groups and associates the information, about the quote, with the quote. The figcaption element was not used, in this case, as a container for the citation as it is not a caption.

但是，我不明白这两个版本之间的区别。有人可以解释区别以及区分 footer 和 figcaption 的重要性吗？

Answer 1

基于以下事实：

如您所见，W3C 规范中的 non-normative 示例似乎相互矛盾。
W3C 规范不包含任何规范文本表明这两个选项都不合适。示例中的一个声称引用不是标题，但由于它不是规范性的，因此您完全有权利不同意。
来自 this WHATWG issue，在职规范编辑器以及 W3C CSSWG（即不是 HTML WG）成员认为在实践中差异并不重要，尽管前者似乎倾向于figcaption.
在实践中，大多数作者无论如何都会将归因信息放在 figcaption 中，没有明显的影响。

...结论似乎是两者之间没有有意义或实际的区别，选择使用哪个是个人喜好问题。

话虽如此，如果您仍然无法决定，figcaption 更符合这两种规范，而不是在一致性方面（因为 footer 和 figcaption 是 equally conforming），但就它们如何描述其作用和用法而言，尤其是与 figure 元素相关的（通常，您希望与图形关联的文本是它的标题）。无论哪种方式，最重要的是 cite 元素，因为最终它们是传达属性语义的元素，而不是它们的容器元素。

图中的块引用：何时使用页脚，何时使用 figcaption？

A blockquote in a figure: When to use footer, when to use figcaption?

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