Every [JSup Tag type|tag type] has its own default initial value:

• [JSup boolean tags|Boolean]: false.
• [JSup numeric tags|Numeric]: 0.
• [JSup string tags|Variable length string]: an empty string
• [JSup string tags|Fixed length string]: a string of requested length filled with spaces (or other pad character defined by the [JSup Tag classes|tag class].
• [JSup Object tags|Object]: null (an [JSup Object tags|object tag] cannot have custom initial value).

A custom initial value of a tag can by provided by the [JSup Tag classes|tag class] the [JSup tag|tag] belongs to or by using the initialValue [JSup Using tag properties|tag property].