If units including em or rem are applied to descendant elements that inherit the system font then the text will scale by the units based on the default font text specified by the system font.Įxamples of this technique include but are not limited to: Use of the system fonts is designed to affect the font size and thus setting the CSS font-size on an element will override the font size applied by the platform. Using the apple-system fonts does not preclude allowing the following CSS properties to be set for all content including the content affected by the system font. The following vendor specific CSS font properties are available on iOS: The objective of this technique is to use the platform system font which takes into account the user’s text size settings of the platform in iOS via the dynamic text options. User Agent and Assistive Technology Support Notes visual-audio-contrast: 1.4.4 Resize text: (sufficient).This technique is to be used to support resize of web text content on iOS. Mobile Technique – Specifying a system font in web content to support platform text resize without browser or platform assistive technology zoom. 1.6 User Agent and Assistive Technology Support Notes.

1 Mobile Technique – Specifying a system font in web content to support platform text resize without browser or platform assistive technology zoom.

Apple default font