Note: If you are using subtabs, `tabFormat` is used differently, but you still use the same format within each subtabs. [See here for more on subtabs](subtabs-and-microtabs.md).
Custom tab layouts can be used to do basically anything in a tab window, especially combined with the "style" layer feature. The `tabFormat` feature is an array of things, like this:
It is a list of components, which can be either just a name, or an array with arguments. If it's an array, the first item is the name of the component, the second is the data passed into it, and the third (optional) applies a CSS style to it with a "CSS object", where the keys are CSS attributes.
- blank: Adds empty space. The default dimensions are 8px x 17px. The argument changes the dimensions. If it's a single value (e.g. "20px"), that determines the height. If you have a pair of arguments, the first is width and the second is height.
- column: Display a list of components vertically. The argument is an array of components in the tab layout format. This is useful to display columns within a row.
- resource-display: The text that displays the currency that this layer is based on, as well as the best and/or total values for this layer's prestige currency (if they are put in `startData` for this layer).
- prestige-button: The argument is a string that the prestige button should say before the amount of currency you will gain. It can also be a function that returns updating text.
- buyables, clickables: Display all of the buyables/clickables for this layer, as appropriate. The argument is optional and is the size of the boxes in pixels.
- upgrade, milestone, challenge, buyable, clickable, achievement: An individual upgrade, challenge, etc. The argument is the id. This can be used if you want to have upgrades split up across multiple subtabs, for example.