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Others

• AMP for Email (amp4email)
• BIMI (bimi, logo, brand)

CSS

• accent-color (accent,color)
• align-items (align,items,flexbox,grid)
• animation (keyframes)
• aspect-ratio (ratio)
• @font-face (font face, web fonts, google fonts)
• @import (css, style)
• @keyframes (animation)
• @media (media queries, media query, media feature)
• @media (-webkit-device-pixel-ratio) (media queries, media query, media feature)
• @media (hover), @media (any-hover) (media, media query, hover, any-hover)
• @media (orientation) (media queries, media query, media feature, portrait, landscape)
• @media (prefers-color-scheme) (media queries, media query, media feature, dark mode, light mode)
• @media (prefers-reduced-motion) (media queries, media query, media feature, prefers-reduced-motion, animation, accessibility)
• @supports (feature queries)
• backdrop-filter (filter)
• background
• background-blend-mode
• background-clip
• background-color
• background-image
• background-origin
• background-position
• background-repeat
• background-size
• block-size & inline-size (block-size, inline-size)
• border (border-width, border-style, border-color, border-top, border-bottom, border-left, border-right, border-top-width, border-top-style, border-top-color, border-bottom-width, border-bottom-style, border-bottom-color, border-left-width, border-left-style, border-left-color, border-right-width, border-right-style, border-right-color)
• border-collapse (table)
• border-image
• border-inline & border-block (border-inline, border-block)
• border-inline & border-block individual logical properties (border-inline-color, border-block-color, border-inline-style, border-block-style, border-inline-width, border-block-width, border-inline-start, border-inline-end, border-block-start, border-block-end)
• border-inline & border-block longhand properties (border-inline-start-color, border-block-start-color, border-inline-start-style, border-block-start-style, border-inline-start-width, border-block-start-width, border-inline-end-color, border-block-end-color, border-inline-end-style, border-block-end-style, border-inline-end-width, border-block-end-width)
• border-radius (rounded corners)
• border-radius logical properties (border-start-start-radius, border-start-end-radius, border-end-start-radius, border-end-end-radius)
• border-spacing (table)
• box-shadow
• box-sizing (box model)
• caption-side (caption,table)
• clip-path (clip,path,svg,mask)
• color-scheme CSS property (dark mode, light mode)
• column-count (columns)
• css column properties (columns, column-count, column-fill, column-gap, column-rule, column-rule-color, column-rule-style, column-rule-width, column-span, column-width)
• CSS comments
• conic-gradient() (gradients)
• direction
• display (inline, block, inline-block)
• display:flex (flexbox)
• display:grid
• display:none
• empty-cells (blank)
• filter
• flex-direction:column (flexbox)
• flex-wrap: wrap (flexbox)
• float
• font shorthand
• font-kerning (font,kerning)
• font-size (font,size)
• font-stretch (font)
• font-weight (font,weight)
• clamp()
• light-dark() (dark, light)
• max()
• min()
• gap, column-gap, row-gap (gap)
• grid-template-* properties (grid-template, grid-template-areas, grid-template-columns, grid-template-rows)
• height property
• hyphenate-character (hyphens, break)
• hyphenate-limit-chars
• hyphens (hyphens, break)
• !important keyword
• inline-size
• inset
• fit-content, min-content, max-content
• justify-content (justify,align,flexbox,grid)
• left, right, top, bottom (absolute, sticky, fixed, relative, position)
• letter-spacing
• line-height
• linear-gradient() (gradients)
• list-style
• list-style-image
• list-style-position
• list-style-type
• margin (margin-left, margin-right, margin-top, margin-bottom)
• margin-block-start & margin-block-end (margin-block-start, margin-block-end)
• margin-inline & margin-block (margin-inline, margin-block)
• margin-inline & margin-block (margin-inline, margin-block)
• margin-inline-start & margin-inline-end (margin-inline-start, margin-inline-end)
• max-block-size (max, block, size)
• max-height property
• max-inline-size (max, inline, size)
• max-width (size)
• min-block-size (min, block, size)
• min-height property
• min-inline-size (min, inline, size)
• min-width property
• mix-blend-mode (mix-blend-mode,blend,filter)
• lch(), oklch(), lab(), oklab() (color)
• CSS Nesting
• object-fit
• object-position
• opacity
• orphans (columns)
• outline
• outline-offset
• overflow
• overflow-wrap
• padding
• padding-block-start & padding-block-end (padding-block-start, padding-block-end)
• padding-inline & padding-block (padding-inline, padding-block)
• padding-inline-start & padding-inline-end (padding-inline-start, padding-inline-end)
• position (absolute, sticky, fixed, relative, static)
• :active (pseudo-class)
• :checked (check, interactive, pseudo-class)
• :first-child
• :first-of-type
• :focus (pseudo-class)
• :has()
• :hover (rollover, pseudo-class)
• lang()
• :last-child
• :last-of-type
• :link (pseudo-class)
• :not (pseudo-class)
• :nth-child
• :nth-last-child
• :nth-last-of-type
• :nth-of-type
• :only-child
• :only-of-type
• :target (pseudo-class)
• :visited (pseudo-class)
• ::after (pseudo-element)
• ::before (pseudo-element)
• ::first-letter (pseudo-element)
• ::first-line (pseudo-element)
• ::marker (pseudo-element)
• ::placeholder (pseudo-element)
• radial-gradient() (gradients)
• resize (textarea)
• rgb() (rgb,color)
• rgba() (rgb,rgba,color,alpha)
• scroll-snap
• Adjacent sibling combinator
• Attribute selector
• Chaining selectors
• Child combinator
• Class selector
• Descendant combinator
• General sibling combinator
• Grouping selectors
• ID selector
• Type selector (element)
• Universal selector *
• shape-margin (shape, margin)
• shape-outside (shape)
• system-ui, ui-serif, ui-sans-serif, ui-rounded, ui-monospace
• tab-size (tab,size)
• table-layout (table,layout)
• text-align (align)
• text-align-last (align, align-last)
• text-decoration (underline)
• text-decoration-color (underline)
• text-decoration-line (underline, overline, line-through)
• text-decoration-skip-ink (underline)
• text-decoration-style (underline)
• text-decoration-thickness (underline)
• text-emphasis
• text-emphasis-position
• text-indent (indent)
• text-justify
• text-orientation (vertical orientation)
• text-overflow
• text-shadow
• text-transform
• text-underline-offset (underline)
• text-underline-position (underline)
• text-wrap
• transform
• transition (animation)
• CSS calc() function (unit, calc)
• ch unit (unit, ch)
• cm unit (unit, cm)
• em unit (unit, em)
• ex unit (unit, ex)
• in unit (unit, in)
• initial unit (unit, initial)
• mm unit (unit, mm)
• pc unit (unit, pc)
• % unit (unit, %)
• pt unit (unit, pt)
• px unit (unit, px)
• rem unit (unit, rem)
• vh unit (unit, vh)
• vmax unit (unit, vmax)
• vmin unit (unit, vmin)
• vw unit (unit, vw)
• user-select (select, copy)
• CSS Variables (Custom Properties)
• vertical-align
• visibility
• white-space
• white-space-collapse (break, space, collapse, hide)
• widows (columns)
• width property
• word-break (a, b, c)
• word-spacing (word)
• writing-mode
• z-index (absolute, sticky, fixed, relative, position)

HTML

• <abbr> element
• <acronym> element
• address (address)
• align attribute (left, center, right)
• Local anchors (hash, fragment identifiers, URLs, URIs, document fragments, local, named, anchor, anchors, links)
• aria-describedby attribute (accessibility, a11y, wai-aria)
• aria-hidden attribute (accessibility, a11y, wai-aria)
• aria-label attribute (accessibility, a11y, wai-aria)
• aria-labelledby attribute (accessibility, a11y, wai-aria)
• aria-live attribute (accessibility, a11y, wai-aria)
• <audio> element (audio)
• background attribute
• <base>
• <bdi> element
• <blockquote> element
• <body> element
• <button type="reset"> element (form, reset, button)
• <button type="submit"> element (form, submit, button)
• cellpadding attribute
• cellspacing attribute
• <code> element
• HTML comments
• <del> element
• <dfn> element
• <dialog> element
• dir attribute (direction, ltr, rtl)
• <div> element
• HTML5 doctype
• <form> element (form)
• <h1> to <h6> elements (headings, h1, h2, h3, h4, h5, h6)
• height attribute
• hidden attribute
• <hr> element
• Image maps (image maps, map element, area element, usemap attribute)
• <img> element
• <input type="checkbox"> element (form, checkbox)
• <input type="hidden"> element (form, hidden)
• <input type="radio"> element (form, radio)
• <input type="reset"> element (form, reset)
• <input type="submit"> element (form, submit)
• <input type="text"> element (form, text)
• lang attribute
• <link> element (css, style)
• <ul>, <ol> and <dl> (ul, ol, li, dl, dt, dd)
• loading attribute (img,image,loading)
• mailto: links
• <marquee> element (marquee)
• color-scheme meta tag (dark-mode)
• <meter> element
• <object> element (object,embed,video,image,pdf)
• <p> element (paragraph)
• <picture> element (picture, responsive image)
• popover attribute
• <pre> element
• <progress> element
• required attribute (form, required)
• role attribute (accessibility, a11y, wai-aria)
• <rp> element
• <rt> element
• <ruby> element
• <select> element (form, select)
• HTML5 semantics (article, aside, details, figcaption, figure, footer, header, main, mark, nav, section, summary, time)
• <small> element
• <span> element
• srcset and sizes attributes
• <strike> element
• <strong> element
• <style> element
• Embedded <svg> image (image, SVG)
• <table> element
• target attribute
• <textarea> element (form, text)
• valign attribute
• <video> element (mp4)
• <wbr> element
• width attribute

Image formats

• Animated PNG image format (image, apng, png, animation)
• AVIF image format (image,img,AVIF)
• Base 64 image format (image, Base 64)
• BMP image format (image, BMP)
• GIF image format (image, GIF)
• HDR image format (image, HDR)
• HEIF image format (image, HEIF)
• ICO image format (image, ICO)
• JPG image format (image, JPG, jpeg)
• Video as Image Assets (mp4)
• PNG image format (image, PNG)
• SVG image format (image, SVG)
• TIFF image format (image, TIFF)
• webP image format (image, webP)