To add comments under an article in an HTML file, you can use the HTML comment tag <!-- -->. Anything placed between <!-- and --> will be treated as a comment and will not be displayed on the webpage.

Here's an example of how to add comments under an article in an HTML file:

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<article>
    <h1>My Article</h1>
    <p>This is the content of my article.</p>

    <!-- This is a comment -->
    <!-- Comments can be used to provide additional information or explanations about the code -->

    <p>More content goes here.</p>
</article>

In this example, the two lines enclosed by <!-- and --> are comments and will not be visible on the webpage. Anything outside of the comments will be displayed normally.

Remember that comments in HTML are a good practice for documenting your code and making it easier to understand. They can be helpful for you or other developers who may be working on or maintaining your code in the future.

To add formatting to the links in the footer to make them visible against the background color and apply a hover effect, you can use CSS. Here's an example:

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/* Format the links in the footer */
footer a {
  color: white; /* add a contrasting color to make the links visible */
  text-decoration: none; /* remove underlines */
  padding: 0.5em; /* add padding to create space around the links */
}

/* Apply hover effect to the links in the footer */
footer a:hover {
  background-color: grey; /* change the background color when hovering */
  color: yellow; /* change the text color when hovering */
}

To apply padding to the header, footer, article, nav, and aside containers, you can use CSS. Here's an example:

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/* Apply padding using em units */
header, footer, article, nav, aside {
  padding: 1em; /* set padding to the same value as the font size */
}

To allow the image to resize with the browser, you can use CSS. Here's an example:

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/* Allow the image to resize */
img {
  max-width: 100%; /* set the maximum width to 100% of its container */
  height: auto; /* maintain aspect ratio of the image */
}

To format the main container to display flex with a column flex direction and flex order of 5, you can use CSS. Here's an example:

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/* Format the main container */
main {
  display: flex; /* enable flexbox */
  flex-direction: column; /* stack its children vertically */
  order: 5; /* set the flex order */
}

To format the section selector to display flex with a row direction, you can use CSS. Here's an example:

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/* Format the section selector */
section {
  display: flex; /* enable flexbox */
  flex-direction: row; /* lay its children out horizontally */
}

Please note that these CSS examples assume you already have a basic HTML structure in place. Adjust the selectors as needed to target the correct elements in your code.

The <article> element is an HTML tag used to represent a self-contained piece of content that can be independently distributed or reused. It is typically used for blog posts, news articles, or user-generated content.

In comparison, the <section> element is used to group related content together. It represents a thematic grouping of content within a document. It can be used to divide a page into different sections, chapters, or tabbed content.

On the other hand, the <div> element is a generic container used to group other HTML elements together. It does not carry any semantic meaning on its own, unlike <article> and <section>. <div> is typically used for styling or manipulating content using CSS or JavaScript.

In summary, while both <article> and <section> are used for grouping content, <article> is used for independent, self-contained content, while <section> is used for grouping related content together. <div> is a generic container used for styling or manipulation purposes.

In HTML, section and article are both used for semantic grouping of content, but there is a slight difference between them.

Use section when you want to group content semantically based on a thematic grouping. It is typically used when you have different sections of content on a page.

For example:

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<section>
  <h2>Fruits</h2>
  <p>Apples are a type of fruit.</p>
  <p>Bananas are another type of fruit.</p>
</section>

<section>
  <h2>Cars</h2>
  <p>Toyota is a popular car brand.</p>
  <p>BMW is a luxury car brand.</p>
</section>

In contrast, use article when you want to represent an independent, self-contained piece of content that can be reused on its own, without any other context. It is typically used for blog posts, news articles, forum posts, etc.

For example:

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<article>
  <h2>10 Surprising Benefits of Eating Apples</h2>
  <p>Apples are not only delicious, but also incredibly healthy...</p>
  <a href="https://example.com/apples">Read more</a>
</article>

<article>
  <h2>BMW Unveils New Electric Car Model</h2>
  <p>BMW has revealed the latest addition to its electric car lineup...</p>
  <a href="https://example.com/bmw">Read more</a>
</article>

In summary, use section for thematic grouping of content, and article for independent pieces of content.

The <article> element represents a self-contained composition in a document, page, application, or site, which is potentially independently distributable or reusable. This could be a forum post, a magazine or newspaper article, a blog post, a user-submitted comment, an interactive widget, or anything else.

The <section> element defines sections in the document, such as chapters, headers, footers, or any other sections of the document. The <section> element can have its own heading, but doesn’t need to.

A recursive function is a function that calls itself in its definition. To write a recursive function:

1. Establish a base case – this is a condition that ends the recursive function call when it is met.
2. Establish a recursive case – this is a condition that makes the recursive call, usually calling the same function.

For example, below is a recursive JavaScript function to compute a factorial:

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function factorial(n){
  // Base case
  if (n === 0) {
     return 1;
  }
  // Recursive case
  else {
     return n * factorial(n - 1);
  }
}

You can learn more about recursive functions from this MDN article.