September 2018 web platform update

Now widely available on the web platform

Widely available

• Classes: Classes are an object-oriented syntax for JavaScript prototypes. Learn more.

• <picture>: The <picture> element is used for art direction in responsive images, where a different image is displayed based on the <source> element. Learn more.

• unset: The unset keyword resets any CSS property, removing any values previously set by the author, user, or browser. Inherited properties (like color) reset to the parent element's computed value. Non-inherited properties (like display) reset to the specified initial value (inline). Learn more.

Newly available on the web platform

Newly available

• font-variation-settings: The font-variation-settings CSS property sets an "axis of variability" on a variable font, such as weight, optical size, or a custom axis defined by the typeface designer. When possible, use other CSS font properties, such as font-weight: bold. Also known as variable fonts. Learn more.

• Speech synthesis: The SpeechSynthesis API converts text to speech with artificial voices. Learn more.