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| Welcome to Learn CSS! | https://web.dev/learn/css/welcome |
| Box Model | https://web.dev/learn/css/box-model |
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| Nesting | https://web.dev/learn/css/nesting |
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| Specificity | https://web.dev/learn/css/specificity |
| Inheritance | https://web.dev/learn/css/inheritance |
| Color | https://web.dev/learn/css/color |
| Sizing Units | https://web.dev/learn/css/sizing |
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| Pseudo-classes | https://web.dev/learn/css/pseudo-classes |
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| The CSS Podcast - 008: Sizing Units
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| inheritance module | https://web.dev/learn/css/inheritance |
| See color lesson | https://web.dev/learn/css/color |
| cm | https://www.w3.org/TR/css-values-4/#cm |
| mm | https://www.w3.org/TR/css-values-4/#mm |
| Q | https://www.w3.org/TR/css-values-4/#q |
| in | https://www.w3.org/TR/css-values-4/#in |
| pc | https://www.w3.org/TR/css-values-4/#pc |
| pt | https://www.w3.org/TR/css-values-4/#pt |
| px | https://www.w3.org/TR/css-values-4/#px |
| em | https://www.w3.org/TR/css-values-4/#em |
| rem | https://www.w3.org/TR/css-values-4/#rem |
| ex | https://www.w3.org/TR/css-values-4/#ex |
| rex | https://www.w3.org/TR/css-values-4/#rex |
| cap | https://www.w3.org/TR/css-values-4/#cap |
| rcap | https://www.w3.org/TR/css-values-4/#rcap |
| ch | https://www.w3.org/TR/css-values-4/#ch |
| character advance | https://www.w3.org/TR/css-values-4/#length-advance-measure |
| rch | https://www.w3.org/TR/css-values-4/#rch |
| ic | https://www.w3.org/TR/css-values-4/#ic |
| character advance | https://www.w3.org/TR/css-values-4/#length-advance-measure |
| ric | https://www.w3.org/TR/css-values-4/#ric |
| lh | https://www.w3.org/TR/css-values-4/#lh |
| rlh | https://www.w3.org/TR/css-values-4/#rlh |
| vw | https://www.w3.org/TR/css-values-4/#vw |
| vh | https://www.w3.org/TR/css-values-4/#vh |
| vi | https://www.w3.org/TR/css-values-4/#vi |
| inline axis | https://www.w3.org/TR/css-writing-modes-4/#inline-axis |
| vb | https://www.w3.org/TR/css-values-4/#vb |
| block axis | https://www.w3.org/TR/css-writing-modes-4/#block-axis |
| vmin | https://www.w3.org/TR/css-values-4/#vmin |
| vmax | https://www.w3.org/TR/css-values-4/#vmax |
| lvw, lvh, lvi, lvb, lvmin, lvmax | https://www.w3.org/TR/css-values-4/#viewport-variants |
| svw, svh, svi, svb, svmin, svmax | https://www.w3.org/TR/css-values-4/#viewport-variants |
| dvw, dvh, dvi, dvb, dvmin, dvmax | https://www.w3.org/TR/css-values-4/#viewport-variants |
| container | https://developer.mozilla.org/docs/Web/CSS/CSS_containment/Container_queries |
| color module | https://web.dev/learn/css/color |
| CSS Spec Values and Units Level 4 | https://www.w3.org/TR/css-values-4 |
| Sizing and Units on MDN | https://developer.mozilla.org/docs/Learn/CSS/Building_blocks/Values_and_units |
| All About Ems | https://learn.scannerlicker.net/2014/07/31/so-how-much-is-an-em/ |
| A percentages explainer | https://2019.wattenberger.com/blog/css-percents |
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