„Element queries are a new way of thinking about responsive web design where the responsive conditions apply to elements on the page instead of the width or height of the browser.
Unlike CSS @media queries, @element Queries are aware of more than just the width and height of the browser, you can write responsive conditions for a number of different situations like how many characters of text or child elements an element contains.
Another concept that element queries brings to CSS is the idea of ‘scoping’ your styles to one element in the same way that JavaScript functions define a new scope for the variables they contain.“

Element Query Conditions

Width-based Conditions

• min-width min-width in px, min-width in %
• max-width max-width in px, max-width in %

Height-based Conditions

• min-height min-height in px, min-height in %
• max-height max-height in px, max-height in %

Count-based Conditions

• min-characters on block elements, on form inputs
• max-characters on block elements, on form inputs
• min-lines min-lines demo
• max-lines max-lines demo
• min-children min-children demo
• max-children max-children demo

Scroll-based Conditions

• min-scroll-y min-scroll-y demo
• max-scroll-y max-scroll-y demo
• min-scroll-x min-scroll-x demo
• max-scroll-x max-scroll-x demo

Aspect-based Conditions

• orientation orientation demo
• min-aspect-ratio min-aspect-ratio demo
• max-aspect-ratio max-aspect-ratio demo

Meta-Selectors

• $this $this demo
• $parent $parent demo
• $root $root demo
• $prev $prev demo
• $next $next demo

Element Queries

„The picture element, srcset and sizes attributes, and associated features allow web developers to deliver an appropriate image to every user depending on a variety of conditions like screen size, viewport size, screen resolution, and more. Picturefill enables support for the picture element and associated features in browsers that do not yet support them, so you can start using them today!“

Picturefill @ Github