Minecraft wiki entry for Parity_issue_list, associated text: "text" takes priority over "translate".
"bold"
"clickEvent"
"change_page"
"copy_to_clipboard"
"open_file"
"open_url"
"run_command"
"suggest_command"
"color"
"extra"
Parents boldness, click event, color, font, hover event, insertion, italicness, obfuscation, strikethrough and underlining.
[1,2,3] is an alias for {"text":"1","extra":[{"text":"2"},{"text":"3"}]}.
"font"
"hoverEvent"
"show_entity"
"show_item"
"show_text"
"insertion"
"italic"
"keybind"
"nbt"
"block"
"entity"
"interpret"
"storage"
Usable in signs, tellraw and title
Can also be set in item name and lore via loot tables.
"obfuscated"
"strikethrough"
"underlined"