The reading-flow and reading-order proposed CSS properties determine the source order of HTML elements in the DOM tree for accessibility tools.Reading-flow values like flex-visual and grid-order help match focus order to the visual order of elements.Reading-flow properties include flex-visual, grid-rows, grid-columns, grid-order, source-order, among others.Reading-flow establishes focus orders in flex or grid layouts, ensuring a logical sequence for accessibility.Reading-order, similar to the 'order' property, specifies the order of specific flex or grid items for accessibility.By setting reading-flow to source-order, reading-order can then be used to control the focus order of elements.Reading-order values work differently from HTML 'tabindex' attributes, offering more flexibility in defining focus order.Reading-flow and reading-order properties are currently supported in Chrome 137+ for enhancing accessibility in web design.These CSS properties allow for adjusting focus order to match visual order, aiding in meeting Web Content Accessibility Guidelines.Using reading-order enables proper use of the 'order' property in flexbox and grid layouts for improved accessibility and usability.