<img src="image.jpg" loading="lazy" class="d-block w-100" alt="..."> Combine this with Bootstrap’s data-bs-interval to allow time for loading. Avoid complex CSS transitions inside carousel items. The default slide transition uses CSS transforms (hardware accelerated). Do not override transition properties unnecessarily. 7.3 Using WebP Images For faster loading, use modern formats. CodePen does not host images, but you can link to WebP images from external CDNs. Example: https://images.pexels.com/photos/...webp 8. Case Study: Building a Testimonial Slider A common use case for carousels beyond images is testimonials. Below is a CodePen-ready example:

<div id="demoSlider" class="carousel slide" data-bs-ride="carousel"> <!-- Indicators --> <div class="carousel-indicators"> <button type="button" data-bs-target="#demoSlider" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button> <button type="button" data-bs-target="#demoSlider" data-bs-slide-to="1" aria-label="Slide 2"></button> <button type="button" data-bs-target="#demoSlider" data-bs-slide-to="2" aria-label="Slide 3"></button> </div> <!-- Slides --> <div class="carousel-inner"> <div class="carousel-item active"> <img src="https://picsum.photos/id/1015/1200/400" class="d-block w-100" alt="Mountain landscape"> <div class="carousel-caption d-none d-md-block"> <h5>First Slide Label</h5> <p>Some representative placeholder content.</p> </div> </div> <div class="carousel-item"> <img src="https://picsum.photos/id/104/1200/400" class="d-block w-100" alt="Lake reflection"> </div> <div class="carousel-item"> <img src="https://picsum.photos/id/106/1200/400" class="d-block w-100" alt="Flower macro"> </div> </div>

// Update indicators accordingly (more complex - requires re-initialization) Slides are not limited to images. You can embed YouTube videos, text, or any HTML:

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