1 · Give it something to read
Text, source, data, Markdown, saved web pages and PDFs. Office documents are out of scope. Your files are read here and never uploaded.
3 · Where it is
What a human sees, and what a parser sees
The left column is your own browser rendering the line. The right column is the same line in the order a compiler, parser or agent reads it, with every directional control written out. This is a comparison, not an implementation of the Unicode Bidirectional Algorithm — see Limits.