Common questions

How do browsers load images?

How do browsers load images?

The primary two ways a web page can load an image are:

  1. An HTML tag.
  2. A CSS background-image.

How do I know if Lazyload is working?

If you want to test the execution of lazy loading, I can recommend that you clear your browser’s cache and try reloading. In Chrome’s Developer Console (F12), you can tweak the speeds and simulate modem speeds. Hit F12 -> Network tab -> Change the “No throttling” dropdown . Choose a slower speed to experiment.

What to do when image does not load in JavaScript?

Don’t resize the image element, as this will also affect the quality of the loaded image when you come to use it. Setting position: absolute to the image is necessary, as the image elements will eventually make it’s way outside of the viewport – causing them to not load, and affect performance.

Why is my browser so slow when loading images?

As you can probably imagine, bringing in all of these images when the page loads can add unnecessary bloat, causing the user to download lots of data they may not see. It can also make the page slow to interact with, due to the page layout constantly changing as new images load in, causing the browser to reprocess the page.

What happens when JavaScript breaks lazy loading images?

Let’s follow this through: if the page loads and JavaScript breaks, the user will see one screen of images (1) and a link to “view more” (2) which will take them to a full page (anchored to where they left off). If the page loads and JavaScript is ok, the link will not be there (4) and the lazy load images will flow into view as intended (3).

What happens if you don’t use JavaScript?

If the browser says it supports JavaScript, then the noscript tags will be ignored. However, the browser may still fail to execute JavaScript for any of the reasons I mentioned at the start, or more. How about this? Load enough images to fill the viewport un-lazily; i.e., just regular img tags with their src attributes set

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