How to change onclick attribute on html file?

Hey guys, i need your help.
This is what i want to do , i got this progress bar and i would like when i click the (link) to change the attribute of number (80) to 100:
data-pro-bar-percent="80" –> data-pro-bar-percent="100"
This is the code:

Code (Text):

<a class="button" href="#">Click Link</a>

    <div class="pro-bar-container color-green-sea">

                    <div class="pro-bar bar-100 color-turquoise" data-pro-bar-percent="30" data-pro-bar-delay="4000">

                        <div…

How to change onclick attribute on html file?

See original post by Megamon