Question 1

How to use lazysizes with React?

Accepted Answer

Lazysizes works automatically with React; add `data-src` and `class='lazyload'` to image elements. For dynamic content, use the `attrchange` plugin to handle attribute updates without manual re-initialization, as mentioned in the plugins section.

Question 2

lazysizes vs native lazy loading in browsers?

Accepted Answer

Lazysizes offers more features like automatic `sizes` calculation, SEO compatibility, and support for iframes and scripts. Native lazy loading is simpler but limited to images and iframes with less control over prefetching and prioritization.

Question 3

How to implement a blur-up effect with lazysizes?

Accepted Answer

Use the blur-up plugin or add custom CSS transitions: set a low-quality placeholder as `src`, apply blur filters, and remove them on load with classes like `blur-up`, as demonstrated in the README's LQIP examples.

Question 4

Does lazysizes work with WordPress?

Accepted Answer

Yes, but it requires enqueueing the script and modifying theme or plugin output to use `data-src` attributes. Some caching plugins have built-in support, but manual integration might be needed for custom setups.

Question 5

How to handle broken images with lazysizes?

Accepted Answer

To avoid broken image symbols, add a transparent data URI as `src` or use CSS like `img.lazyload:not([src]) { visibility: hidden; }`, as suggested in the README's section on broken image symbols.

Question 6

What's the best way to configure lazysizes for a carousel?

Accepted Answer

Lazysizes automatically detects visibility in carousels. For fine-tuning, use `data-expand` attributes to control prefetching or adjust `lazySizesConfig.hFac` for horizontal expansion, as detailed in the JS API options.

Lazysizes

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