No, cursive script is divided into Zhangcao, Jincao and Kuangcao, but only Kuangcao was produced in the Tang Dynasty.
Kangcao was founded in the Tang Dynasty. Zhang Xu from Tang Dynasty was the founder of Kuangcao, so he is known as the "Sage of Grass". The later monk Huaisu was also a master of Kuangcao. Kuang Cao is simpler and faster than today's Cao, and the strokes are more continuous and winding, lively, dancing, galloping and unrestrained, with the potential to gallop thousands of miles.
The ancients said that its shape "may be bunched up and hugging each other, or whirling and drooping, or clustered and neat, or up and down unevenly, or in the shadow of the mountains and held high, or in a fallen position and draped on itself." It is really "many ingenuity and variety, endless and surprising".
The author can use it to express unrestrained and passionate emotions, or to express his ambition to gallop and travel, or to relieve his depressed mood. However, due to the large number of spare strokes and the huge difference in form between regular script and regular script, it is difficult to identify.
Extended information:
Cursive script is a font of Chinese characters. It appeared earlier, from the early Han Dynasty, when writing official script was sometimes written "sloppily". Because Emperor Zhang of the Han Dynasty liked cursive script, it was called "Zhangcao", which is a kind of official script cursive script. The characters in Zhangcao are independent and close to running cursive, but difficult-to-write characters are not simplified much and the writing remains unchanged.
Later, regular script appeared and evolved into "jincao", that is, regular cursive script. It writes quickly, often with upper and lower characters written in succession, and the last stroke echoes the beginning of the stroke. Each character generally has a simplified rule, but it is not very regular. Familiar people are sometimes difficult to recognize. Generally, the cursive scripts of Wang Xizhi, Wang Xianzhi and others are also called Jincao.
The basic method of simplification in Jincao is to substitute simple cursive symbols for regular script radicals into traditional regular script (although cursive script appears not later than regular script). Often many regular script radicals can use one cursive symbol Substitute, for convenience, the structure of the characters has also been changed. Therefore, it is more difficult for unfamiliar people to identify. For the arrangement of cursive symbols, please refer to "Standard Cursive Script".
By the Tang Dynasty, cursive script had become an art of calligraphy, and therefore evolved into "crazy cursive script". Its function as a tool for transmitting information has been weakened, and it has become a work of art that pays attention to the black and white arrangement of shelves and paper. It is no longer important to be able to recognize what is written.
In Kuangcao, there is a "word couplet" symbol, which is to write two words (common phrases) into one symbol. Since writing at that time was mostly written in vertical lines from top to bottom, the design of word couplet symbols was also similar. "Dunshou", "Nirvana", etc. all have cursive word couplet symbols.
Baidu Encyclopedia--Cursive Script