Thoughtbot.com/blog/positioning
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Styling links excellent MOZILLA
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Styling CSS
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Great styling tools summary from beaverjunction.
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How to Smooth Scroll
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CSS Scroll Snap Module Level 1
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Responsive Top Nav W3
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Complete-guide-to-css-scroll-snap-for-awesome-ux
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Google’s excellent css-scroll-snap description
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TOP BAR AND PAGE SCROLLS, HEADBUTTING Jump links and viewport positioning
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Practical CSS Scroll Snapping
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GREAT POSTIONNING TUTORIAL
CSS methodology description: | Good -› Developer.mozilla.org/en-US/docs/Learn/CSS/Building_blocks/Organizing – article
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HTML Custom Elements | Great and clear -› developers.google.com/web/fundamentals/web-components – courseware
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Jump-links-and-viewport-positioning