Revise flex-direction property

[estelle]

• removed explanations from syntax section and moved them to new description section
• changed syntax to standard "keyword" header
• removed note and moved it to new description section
• add values intro statement
• removed descriptions from values and moved them to new description section
• created a description section
• updated the links in the a11y section to remove two, update one, and set all to standard mdn way to present external links.

i am not fully sure why were were using main-start and main-end explanations, but i kept them, added cross-start and cross-end, and equated them to inline/block-start/end

[github-actions]

Preview URLs (1 page)

• /en-US/docs/Web/CSS/Reference/Properties/flex-direction

External URLs (2)

URL: /en-US/docs/Web/CSS/Reference/Properties/flex-direction
Title: flex-direction CSS property

• https://tink.uk/flexbox-the-keyboard-navigation-disconnect/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/WAI/WCAG22/Understanding/meaningful-sequence (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2026-08-05 07:29:21)

[dipikabh]

Great work! Thanks @estelle for the cleanup and the rewrite

[dipikabh]

Not sure if we should remove these two links.
The source order link seems to be directly related to the last sentence about visual vs DOM order