(Share a jQuery "sticky" reading progress bar page scroll navigation bar top effect, I recently developed it. When the viewport is too narrow, it will be hidden at the top of the viewport on the scroll bar to show the reading progress in sections and in each section. It can also be used for navigation. The HTML for the progress bar is dynamically generated on PaGeload based on the elements used to define each section (in this case, the H2 title). Applicable browsers: 360, FireFox, Chrome, Safari, Opera, Maxthon, Sogou, Window of the World. IE8 and below browsers are not supported.)
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