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By clicking the menu on side of the page it is loaded along with the corresponding slide transition animations, but also with the progress bar effect. Of course, the page loaded is driven by Ajax, the entire loading process of transition is very smooth, with very good user experience.
HTML structure, .cd-main body of the page contains content, .cd-side-navigation contains the side navigation bar, # cd-loading-bar is used to make a progress bar with animation.