![]() ![]() From what I read so far, using either the blend or overlay filter should help in achieving what I'm after but I can't figure out the command line details to get it to work. I'm new to ffmpeg and am mostly relying on tweaking what I can find in the documentation and existing examples online. Using smooth transitions can make an unexpected content change a lot less jarring.I've been trying to achieve a crossfade transition between 2 video clips using ffmpeg but have failed so far. To Braintree’s credit it does so with a smooth transition which helps maintain some continuity, but the page I worked on still benefitted from a wrapper element with a min-height, keeping something as fundamental as the checkout button from moving around unexpectedly. It’s a great little widget, but you’ll notice that even on Braintree’s own site the content gets pushed around when the widget expands. Another Example: A Third-Party WidgetĪnother time, I was working on a client site who wanted to use the Braintree drop-in UI () for their checkout page. See the Pen Avoiding Content Jumps by CSS-Tricks ( on CodePen. ![]() Here’s an example of what this would look like (rerun to see delayed ad loading): If the content ends up making the element taller, it can still do that, which isn’t great, but it’s slightly better than doing nothing. This is why we used min-height instead of height. One could debate whether hardcoding the minimum height is wise, given that it decouples the layout from the content. These simple additions made the interface much more concrete and predictable. I also set a background color for the containers to suggest that something would go there. This meant that the surrounding layout began in more or less the state that it would end up, with the only change being the interior of the content boxes. We could measure the size of it here and set min-height: 363px on a placeholder element. To fix it, I used the browser’s DevTools to measure the height of the resulting content and hardcoded it as a min-height for the container in the CSS. A few seconds after initial visit the headings (and sometimes other static content) would all jump down – exactly the jarring layout shifting experience we’re trying to avoid. It worked quite well, but in some cases, we had multiple of these sections going down the page with static headers in-between. We created Ajax containers bound to server routes that would re-render and send back just a section of the page. We didn’t want to rebuild the whole thing using something like Angular, but we did want some of the content to be able to update without a page refresh. I was working at Broadleaf Commerce, on a preexisting Admin interface that we were adding features to. The first time I encountered this problem actually wasn’t for ads or images, but for rendered templates from our own server. I’ve run into this problem on sites I work on myself It’s especially common with ads but can happen with any layout-affecting content that loads after initial render, including images or even fonts. But when it does finish, and the results are plopped into the document, it can cause re-layout and push other elements around. Ajax is asynchronous, meaning nothing is waiting for it to finish. ![]() ![]() Most commonly, it’s the result of loading Ajax partials. Luckily, modern browsers don’t perform initial render until the style sheets have finished loading, which means that with some clever CSS we can do a lot toward fixing this problem. I’m surprised to see it happen even on really big-name sites that are otherwise very well made. I would argue that shifting the page layout after the initial render (without relevant user interaction) may be the single most unpleasant user experience a site can create. This layout shifting is especially frustrating on mobile devices, where a big enough change can push all familiar content off-screen and cause a visitor to completely lose her bearings. Whether you’re attempting to read an article as it wriggles around in front of you, or you try to click a link only to have another one push it out of the way and take you off to somewhere unexpected, it’s always frustrating. Few things are as annoying on the web as having the page layout unexpectedly change or shift while you’re trying to view or interact with it. ![]()
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