Footer at bottom of page or content, whichever is lower

Making footer's height static

Assign a fixed-height to your footer to prevent unintentional layout shifts. The bottom "padding" value for #content should be equal to the footer's defined height:

#content {
    padding-bottom: 50px; /* Same value as footer height; content and footer respect each other's space ✌️ */
    box-sizing: border-box;
}


This assures the content doesn't lurk behind the footer, allowing clear separation between them.

Guaranteeing dynamic content with flexible footer

In case of dynamically sized footer, utilize Flexbox:

footer {
    flex-shrink: 0; /* Just like a stubborn mule, the footer won't shrink! 🦾 */
}


This ensures your footer never shrinks regardless of the content area growth or shrinkage. It's a neat little life vest for your footer to stay afloat!

Ensuring 100% container height

Make sure your container scales at least as tall as the viewport:

#container {
    min-height: 100vh; /* Full height scenario, no hobbit-sized stuff here 🧙‍♂️ */
    flex-direction: column;
}
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This uses viewport units to ensure a full-screen height container regardless of content volume.

The content and footer: A well-crafted duo

An HTML layout with a good structure is paramount for maintenance and readability:

<header>Your header</header>
<nav>Your nav</nav>
<article>Your content</article>
<footer>Your footer</footer>
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These tags: header, nav, article, and footer in the same hierarchical level, make a neat structure and maintainability like a well-sorted bookshelf 📚.

Aligning content and footer with CSS Grid

CSS Grid can also help manage footer positioning:

body {
    display: grid;
    grid-template-rows: 1fr auto; /* 1fr for content because it’s hungry for space, auto for the light-footed footer */
    min-height: 100vh; /* Full view ahead! 🚀 */
}
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The 1fr property allows the content to occupy as much space as it may need, keeping the footer planted firm at the end of the page or content.

Making footer responsive

For a consistent footer across various devices, use media queries:

@media (max-width: 600px) {
    footer {
        height: 100px; /* Footer height takes a leap when viewport sneezes! 🤧 */
    }
    #content {
        padding-bottom: 100px; /* Padding plays catch up! 🏃‍♂️ */
    }
}


Adjust the footer's height and content’s bottom padding based on the viewport width for a responsive design.

Pro tips for sticky footers

Test your website under different scenarios to make sure your footer behaves as expected with differing content sizes. Regularly check resources like CSS-Tricks for updated methods and new demos to stay tuned with different sticky footer techniques.

Using semantic HTML allows for a simple and accessible structure, and consider vh units for responsiveness.

Creating a working demo

Create an interactive demo using a service like CodePen to showcase your solution practically. This strengthens the understanding of your proposed approach.