The official terms for what you call the flex axis and the flex normal are the main axis and the cross axis. https://www.w3.org/TR/css-flexbox-1/#box-model htt

The official terms for what you call the flex axis and the flex normal are the main axis and the cross axis. https://www.w3.org/TR/css-flexbox-1/#box-model https://www.w3.org/TR/css-flexbox-1/#box-model