I've created a web page, and it has 7 six sections with huge background images using background-size: cover;. It works fine in all browsers except Google Chrome (All versions/All platforms). When I try scrolling the page in google chrome or click on its links (which they also scroll the page using $.scrollTo) the page gets choppy and laggy and it scrolls slowly and uses 100% CPU.
I've uploaded the page so you can test it: http://baaemail.com/beta (I'll remove the page later). Even IE9/10 is fine, but chrome gets choppy.
The page has several "scroll" events bound to it and I have tried disabling the javascript altogether but it doesn't get better so its not from the scroll events.
I'm using background-size: cover because it shapes the photo exactly like I want it to and I want the image to be fixed that's why I can't use other methods like using img tag instead of backgrounds.
What should I do?
thanks.
A solution I found for myself for a website with similar behaviour was to add background-repeat:no-repeat css property for those divs containing huge background images.
You can also check if you have a background image for body or html that is repeated, for me the big problem was a repeated pattern image that interfered considerably with google chrome's scrolling performance.
Also if you're using CSS transitions on those "slides" you should check that those are not assigned to "all". If you're having a transition only for the "left" property there is no point assigning it for "all".
I'm not sure if this alone will help you but it is always a good practice to compress your images and your scripts.
This stuff did the trick for me. Hope it helps.
Related
I am working on a web application that allows me to insert some custom css for the front page.
I want to have a full screen background image at the start page. I understand that I can use background-size:cover which is supported in all latest version of browsers.
body {
background-image:url(/File/Publisher/Start/startpage_background.jpg);
background-repeat:no-repeat;
background-size:cover;
}
This works for latest version of Firefox and Chrome. However, it is not working in IE11. The background image does not shrink to cover the entire screen. It displays at its original size and is partially cropped off.
Using F12 to debug, I discover that if I disable either margin-top or margin-bottom (see screenshot), background-size property will work.
I do not want to modify the margin property introduced by the original CSS of the web application. Any way to resolve this problem?
I came across this as well and found that giving body any height makes the cover property have effect as long as it's not set as a percentage. For good order, min-height: 100vh should do :
http://codepen.io/anon/pen/oXmzLL?editors=010
Pretty odd since there's no issue on any other browser but that's IE for ya. Of course it's only present if the content doesn't exceed the window size (edit - it should also not have positioning that takes it out of the document flow).
Not the quickest answer by the way but it's the only topic I came across on this subject (that wasn't about legacy browser support)...
This is the strangest bug I've ever encountered with chrome, unfortunately I cannot show you example images because of legal restrictions but I'll try to explain it as good as possible.
So I'm building this website which has an infinite scroll through viewport-sized sections. In the first section I have a form and an html5 video with position fixed in the background and then simple background images for the followup sections, odd numbered sections with background-attachment: fixed; which gives somewhat of a parallax effect.
Now the very odd thing is: as soon as I have focused one of the form inputs in the first section, all the sections with background-attachment: fixed; lose their background image... it's still in the CSS rule but doesn't get rendered (just white).
I tried several solutions for similar issues like this SO thread or this post. Now the funniest thing with the second one is if I add -webkit-transform or -scale to the sections with fixed bg images, the problem occurs right away without any focusing... I really cannot figure this out.
I hope someone can help me with this issue because it's pretty important to have that parallax like behavior.
Here's a jsfiddle showing the problem anyway, not exactly like on my page but you can see the bug, there the video is shown instead of the image, but on my page I set the video to position absolute after scroll has reached the 2nd section, so it's just white...
I too have encountered this problem.
The thing is that background-position will make content fixed at that position based on the browser window.
For parallax effect, try with some plugins
I'm going nuts on this, I can't figure out what causes the margins of the right sidebar gallery images to be rendered differently on opera browser. More specifically the bottom margin of the images seems to be doubled in every other common browser, its set to 2px and only opera displays it as 2 px.
This is the url - http://www.roxopolis.de/media See screenshots here.
Please help me out with this, I don't care too much about the fact that its displayed differently but it exposes a bit of the following gallery images which are supposed to remain hidden so thats what bothers me. If there is another way to hide the following images (which are placed by widget) that'd be fine too. Maybe setting the margin conditionally for opera?
I've had a quick look at the page in Dragonfly as well as Chrome's inspector for comparison and no particular style, including inherited ones, strikes me as "causing" this issue. Maybe someone else can find something, but at a glance, I'd say Opera seems to be "doing the right thing".
You might have more control over the spacing if you put each anchor tag along with its respective image inside its own container and tried to style those (e.g. a div containing the anchor containing the image for each item, and float them left within the parent container div).
Is there a particular reason you have more images than you want to display? I don't see any controls to scroll the images on that page, so I'm not sure why you need to have more than the six images you're showing already. Surely if you have code somewhere that randomises the order, you can change it so that it only displays the first six images.
Also, have you tried breaking the problem down to a smaller use case that can be tested/tweaked in a jsfiddle? That may help to get to the bottom of your issue if you can't solve it using the above suggestion.
I have a fairly image heavy site and have image rollovers (:hover) on a lot of images on the page. The page loads but the rollovers images take longer to load and cause a flickering when the user intially rolls over the image. I know that this issue has been disscussed many times however I have not found an appropriate solution that works.
I am using safari, background rollovers are done through css. Need some kind of hover image preloader or delay script or similar but any suggestion is welcome
Thanks
Check out CSS Sprites. That's the time-tested, tried and true technique for avoiding flicker like this on hovers.
Say there is a css style declaration to an element which has been set display:none (not displayed on screen) and it also has a background image set.
Lets say this element is displayed on an event such as a mouse click. Would the browser load these images even before the element is displayed? Is this load behaviour consistent across browsers?
There's not a lot of good info on this topic, so I did some tests on webpagetest.org using a testpage by Steve Souders.
It turns out that of all browsers tested, only Firefox does not load a background-image with display:none. You can see the test results on my blog here.
No, browsers I've tested before do not.
if you do want to load the image, try using background-position: -1000px -1000px which does work. It won't show the image, but it will be preloaded. However, the element will be in the normal flow, i.e. not hidden.
It is not loaded automatically but you can use a Javascript trick to preload an image.
pic = new Image();
pic.src="http://url/imagetoload.png";
As a better solution, you may create a div with a negative positioning value (such as left: -1000px) and assign imagetoload.png to its background to load the image.