w3 Examples to Add

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https://www.w3schools.com/howto/howto_css_mega_menu.asp
https://www.w3schools.com/howto/howto_js_navbar_shrink_scroll.asp
https://www.w3schools.com/howto/howto_js_fullscreen_overlay.asp
https://www.w3schools.com/howto/howto_css_sidebar_responsive.asp
https://www.w3schools.com/howto/howto_css_sidenav_buttons.asp
https://www.w3schools.com/howto/howto_js_filter_table.asp
https://www.w3schools.com/howto/howto_css_table_zebra.asp
https://www.w3schools.com/howto/howto_js_rangeslider.asp
https://www.w3schools.com/howto/howto_css_skill_bar.asp
https://www.w3schools.com/howto/howto_css_browser_window.asp
https://www.w3schools.com/howto/howto_css_devices.asp
https://www.w3schools.com/howto/howto_js_countdown.asp