We discuss a bunch of new CSS features you should know in 2026. Not all of them are baseline available but we should be ready for when they are. Here are the new things we talk about:

• corner-shape: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/corner-shape
• Custom Select: https://developer.mozilla.org/en-US/docs/Learn_web_development/Extensions/Forms/Customizable_select
• Scroll State: https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Conditional_rules/Container_scroll-state_queries
• Text Box: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/text-box
• Sibling Index: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/sibling-index
• Sibling Count: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/sibling-count
• if() functions: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/if
• Custom Functions: https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Custom_functions_and_mixins/Using_custom_functions
• width, height: stretch https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/width#stretch
• shape function: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/basic-shape/shape
• Scroll Markers: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/::scroll-marker

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