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ELEMENTS NOT SUPPORTED IN CHROME 30 BROWSER

SVG fragment identifiers

Method of displaying only a part of an SVG image by defining a view ID or view box dimensions as the file's fragment identifier.

Array.prototype.includes

Determines whether or not an array includes the given value, returning a boolean value (unlike indexOf).

Async functions

Async function make it possible to treat functions returning Promise objects as if they were synchronous.

Minimum length attribute for input fields

Declares a lower bound on the number of characters a user can input.

Srcset and sizes attributes

The srcset and sizes attributes on img (or source) elements allow authors to define various image resources and "hints" that assist a user agent to determine the most appropriate image source to display (e.g. high-resolution displays, small monitors, etc).

prefers-reduced-motion media query

CSS media query based on a user preference for preferring reduced motion (animation, etc).

CSS3 object-fit/object-position

Method of specifying how an object (image or video) should fit inside its box. object-fit options include "contain" (fit according to aspect ratio), "fill" (stretches object to fill) and "cover" (overflows box but maintains ratio), where object-position allows the object to be repositioned like background-image does.

text-decoration styling

Method of defining the type, style and color of lines in the text-decoration property. These can be defined as shorthand (e.g. text-decoration: line-through dashed blue) or as single properties (e.g. text-decoration-color: blue)

CSS Hyphenation

Method of controlling when words at the end of lines should be hyphenated using the "hyphens" property.

Variable fonts

OpenType font settings that allows a single font file to behave like multiple fonts: it can contain all the allowed variations in width, weight, slant, optical size, or any other exposed axes of variation as defined by the font designer. Variations can be applied via the font-variation-settings property.

selector list argument of :not()

Selectors Level 4 allows the :not() pseudo-class to accept a list of selectors, which the element must not match any of. Selectors Level 3 only allowed :not() to accept a single simple selector. Thus, :not(a):not(.b):not([c]) can instead be written as :not(a, .b, [c])