prefixfree | Break free from CSS prefix hell

I have this loading bar. When you add active to div class="step", it adds progression. How do I add a next and previous button that makes active according to the step you are on.

Please help!

This is the code for my feedback page. The purpose of it is to get the feedback from patients.The problem that I am facing is that the data is not being sent to firebase. I have tried using a similar code on another page and it worked perfectly but even in that at first it did not work despite deploying the website again and again and eventually it worked after i typed console.log(). Secondly the submit button is supposed to redirect to index.html but it is not working.

I actually guessed this would happen but just some seconds after posting I got a flag for "possible duplicate" which is not appropriate! This question is about CSS values and NOT about CSS property names and so it's not a dup of this or this question!!! Its also not a dup of this one because I'm asking for a generic solution.
If you are still not convinced or unsure about what this post is not about, maybe you take a look at the bottom of this question: "What I'm NOT Looking For" and "Who Is NOT Getting The Job Done"

Is there a way to set an appropriate vendor-prefixed CSS value client-side via JavaScript if needed?

for example: background: -prefix-linear-gradient{...}

I would love to get a generic solution on how to set vendor-prefixed CSS values client-side via JavaScript. Besides this the question is about how to do this client-side and not as a part of the build process (eg POSTcss).

But I also appreciate any hints on

• JavaScript / jQuery plugins that get the job done or
• additional resources that could let me figure it out on my own.

As you can see I already gave an answer on my own. But I'm still looking for better solutions as Autoprefixer comes along with a heavy payload of about 626 KB!

Hello i am creating a form in which user have to find password to access the other page.As I am hard codding correct password in my if condition.Some users will inspect it and know the password.So I am struggling to hide my if statement or even all JavaScript code from being inspected.

The following script moves a ball from one location to another inside a box.

I would like to gather the coordinates of where the mouse is clicked inside this box and convert the X and Y coordinates onclick over to PHP variables so some additional PHP code can process this.

How can this be done please?

I have a simple index.html file as a landing page that displays a fullscreen gif:

I'm not sure why, but there is a small gap between my nav bar and the banner image on top. I've tried checking if I had some kind of padding or margins on the elements that would be causing it, but I can't identify anything wrong.

I'm trying to implement this Polyfill in my Vue.js project:

Fiddle: https://mikethedj4.github.io/kodeWeave/editor/#6aade2727e9d2a1a20eea1e948fe7dbc

I'm having a little difficulty parsing JSON from a string. In my app I'm grabbing it in an onclick event