Develop Reference

Unexplainable CSS Positioning Issue Somehow Related To Transitions

I know that this is not a 'good question' to pose—but I'm desperate by now and need to find some inspiration.
I have a questionnaire page/web-app that uses CSS transitions to slide to the next page of questions/options.
It is well-tested and the transitions in question aren't complex.
But the transition to one special page went out of control recently. And although I consider myself well versed in CSS and JavaScript I'm totally lost with this problem.
The construct in question works like this:
I have a 'window' that is positioned absolutely and has its overflow hidden.
Inside that is a page container positioned relative to no left or top values or transforms given.
The pages inside this container are positioned absolutely according to their status classes positioned on the left: 0 (active), left 100% (not yet shown), and left: -100% (already done)
What happens now is that when I switch classes to show a certain page, the page container 'jumps to the left'. In Chrome nearly -100% in Firefox about -70% same in Safari.
Those values are my guess because when I open the dev-tools, nothing is to be found in the styles, in the computed values anywhere.
When I move back to the previous page the container jumps back to its original position, and if I move again to the critical page it stays.
I do no positioning whatsoever with JavaScript anywhere, I only switch classes on HTML elements.
After hours of experimenting back and forth, I found out that the problem is in some way JavaScript-related anyhow.
Using the exact same CSS and HTML with a slightly older version of JavaScript does not show the strange behavior. The changes in the Script are mostly ES2020-module related, and the new version does nothing even remotely related to DOM manipulation different from the older working version.
When not using transitions, the shift of the container does not occur.
Has anyone come across something similar?
Does anyone know of other tools to deeper analyze the current layout state of a page more than the respective developer tools of the browsers?
Any other ideas?

Today I found a solution and at least some kind of explanation, but I still have to investigate some more to truly understand the why and how. I'll post an update if I find a better explanation.
The problem has to do with a text field and focus.
The page in question has a text (search) as its main component.
[I am aware and always was that browsers try to move focused elements into view, regardless of what the author's CSS says.
Therefore, when I decided to give focus to the text field which it does not have on its own, as every page movement required a button to be clicked, I did so on transitionend. This has never changed.
When the issue first occurred, one of the things I tried first was to disable that (auto) focus behavior. It did not solve the problem.
I cannot say what made that change in behavior happen. I change the construction of the page to include a grid some time before the issue occurred. That in itself was not the reason, however (it worked for quite some time with that system, and removing it did not sole the behavior).]
What solved the issue was to initially fully disable the text field and only enable it on transitionend (then focusing it).
The reason browsers moved the page to different positions likely has to do with this situation, as the text fields width is ch based.
The important takeaway (for now) for me is, that there is no hint to be found in the developer tools when the browsers moves - elements in the (in my case unsuccessful) attempt to keep inputs in the viewport.
I think that this should be changed/fixed.
I will as soon as I have the time try to better understand the things that made the problem occur, If someone has information or experience with similar situations pleas add useful hints and background info.

twitter-bootstrap-wizard bug switching step just by scrolling

I have to do a wizard like
THIS
, I implemented it easily, it almost works but a weird bug stopped me to continue.
In fact, when you are on the first step, "First" is kind of active/highlighted, but for me when I just scroll, it passes from First to Third without changing the content witch is different. and continuously switch from third to second tab just by scrolling slowly. I don't know why... I tried a lot of different implementations and on different browsers but the same bug appears.
Please someone had the same issue x)

I figured out that it was because I used the navbar class for it and it was used to for the upside menu and when scrolling down the navbar's menu was switching style and the navbar used for the wizard was switching style too (obvious) so I just had to unput the navbar class for the wizard. I dunno if I'm understandable but I least I tried :)
Note: this was extracted from the question and posted on behalf of the OP

Slideshow lacks Javascript animation

I found this beautiful website (http://soworldwide.org/) and want to create a similar slideshow. After I've spend a lot of time to make it work, I still can't figure it out.
Right now it's looking like this:
http://bit.ly/1bktxcx
Wait undtil the last picture and then you can see how the slideshow refreshes. Can someone help me, so I get the same animation like theirs?
I'm using the same Jquery Plugin by the way.
Thank you in advance.

You're setting the top of the list-begin image to zero at the same time that you're starting the animation for the list-end image. Because the zIndex of the list-begin image is 3, you're causing the list-begin image to hide the animation of the list-end image. I recommend dynamically updating the zIndex for each image when you do the animation. For slides that are hidden (by setting the top to a negative value, as you're doing), you can ignore the zIndex. But before you set the top to zero for your next image, set the zIndex for curr to 1 and the zIndex for next to 0.
Edit: I figured this out using the Chrome JS debugger and liberal use of console.log(). Maybe you did all the right things and still couldn't find the problem, and just needed a second set of eyes. But if you didn't do all the right things, remember: the debugger is a powerful tool.

Weird block of div just outside viewport in Chrome

First off, please excuse my English as it is not my first language.
I have encountered a very weird issue in an online store I am working on. It only happens in Chrome and I simply couldn't figure out what's going on and it's driving me crazy :(
This is the website I am talking about:
heavenlynature.co.nz
To replicate the issue (please bear with me), you need to add a couple of individual items to the shopping cart (at least 2 different items, then click the shopping cart icon (heavenlynature.co.nz/cart), shrink the browser viewport just below the first line of item, like the image below:
http://francisthedesigner.co.nz/images/test/2.png
Then drag the scroll bar downwards, you will find a block of div blocking over the top of the text/image (please try refreshing until the issue appears as sometimes it appears to be loading correctly), like the image below:
http://francisthedesigner.co.nz/images/test/3.png
But as soon as you highlight the page or hover over the div it just disappears. Now this only happens in Chrome and Firefox doesn't seem to replicate this issue.
It seems to happen only in the checkout screens, really losing it trying to make this work, any help will be greatly appreciated :)

Unfortunately even after following your instructions i couldn't replicate your issue. Can you please try to go on your Chrome under Tools/Extensions and disable them all?
Can you also try to replicate this issue from an other computer?

JQuery: Unwanted animation slowdown

Hi to everyone this is my first ask on stackoverflow
I've created a simple code to manage a menu. Here is the code.
http://jsfiddle.net/corvallo/97x89/5/
If I click on "gestione news" all the menu elements will slide left with different delay
and an image (that on jsfiddle u can't see) with the text "Articoli" will appear.
So i click on the image and the text "articoli" will fadeOut and the menu elements will reappear with delay in the same position as before.
So the problem is that if I try for 4-5 times the first animation(that is the sliding left of the menu elements) will slowdown, and if I try again animation will be slower and slower.
I don't that the problem is in the delay() functions but in the $.each(), maybe I'm wrong.
Can someone help me with this.
Thank you in advance.

The animations seem to somewhat be still running for a while after they have apparently done their job. Use the following to see when they stop in Firebug or Chrome:
$(this).animate({"marginLeft":"0px"},"slow", function(){console.log("anim stopped");});
I am not sure why they are still running, but you can stop them before running new animations like this:
$(this).stop().animate({"marginLeft":"0px"},"slow");
This seems to fix the slowdown issues that you are experiencing.

Put your menu in a div. Instead of doing a foreach on each element, animate the main div.
Delay should not be causing your issue as all that does is wait to begin the animation timing, but having that many animations going at once is starting several internal timers instead of just one, which could lead to hiccups.