Use a class like this. .stop { animation-name: none !important; -webkit-animation-name: none !important; } With JQuery you can toggle this class on the element. If it is added, the animation will stop. Update This will show then hide the spinner.
Learn how to create an overlay effect with CSS, using the background-color and opacity properties. An overlay can add a layer of color or transparency over an image, text, or other element. You can also use the background-size, background-image, and position properties to customize your overlay. Follow the examples and tutorials on W3Schools How TO - Overlay.

this will have the loading value starting from 20. Of course only the element wont suffice. You need to move it as the script loads. For that we need JQuery. Here is a simple JQuery script that starts the progress from 0 to 100 and does something in defined time slot.

Pens tagged 'loading-spinner' on CodePen. CodePen doesn't work very well without JavaScript. We're all for progressive enhancement, but CodePen is a bit unique in that it's all about writing and showing front end code, including JavaScript. It's required to use most of the features of CodePen. Loading Overlay. jQuery Loading Overlay Plugin. Uses Javascript to add/remove a loading overlay to a target element. It can be called on any element that should receive the loading overlay, and accepts options for class selectors and loading overlay text. The overlay itself must be styled via CSS. Image Source. Skeleton Screen Example with Code. See the Pen Skeleton Screen Demo by Joe (@hijiangtao) on CodePen.. 5. CSS Loading Spinner. CSS loading spinners indicate that the page is loading as an animation moving along a circular track. The jQuery BlockUI Plugin lets you simulate synchronous behavior when using AJAX, without locking the browser[1] . When activated, it will prevent user activity with the page (or part of the page) until it is deactivated. BlockUI adds elements to the DOM to give it both the appearance and behavior of blocking user interaction.
I am using the great SimpleModal plugin for jQuery from Eric Martin. Currently, I am loading a modal using an iframe to load my requested pages which works as expected. What I would like to implement is a Loading spinner which displays while the content is loading. I am loading my modal as follows:

Resizable. jQuery UI is a curated set of user interface interactions, effects, widgets, and themes built on top of the jQuery JavaScript Library. Whether you're building highly interactive web applications or you just need to add a date picker to a form control, jQuery UI is the perfect choice.

ESUi.
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    • jquery loading spinner overlay example