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CSS Bootstrap 4 Basics (Retired) Responsive Layouts with the Bootstrap Grid Column Ordering and Offsetting

Hiding image will still load it, so it's not very useful for performance

Hi

You said to hide the image on mobile devices so the page will load faster. But hiding it with display: none;—which is what the .hidden-… classes do— will not prevent the browser from downloading the image.

At least that's what I can see in the Chrome network tab.

Also here this is confirmed: http://stackoverflow.com/questions/12158540/does-displaynone-prevent-an-image-from-loading

Just so you guys know ;)

Guil Hernandez : Are there ways to make sure images are not downloaded on mobile devices? Except for only adding them with JavaScript on larger viewports for example? Thx!

Erik Schultz
Erik Schultz
16,232 Points

In my experience I have used javascript to add in images to the DOM depending on the viewport width. Otherwise you can prevent images from being loading by the server using PHP.

1 Answer

Guil Hernandez
STAFF
Guil Hernandez
Treehouse Teacher

Hey Kenny Brijs,

Yep, that is correct -- the image is still requested by the browser. Tim Kadlec wrote a good post about this where he included several tests.

FWIW, I mentioned that "the content will load faster" – meaning, it could be the difference between this:

...and this:

Hope this helps. :)