How to get the font size, font color, font type used for a particular text on a web page

Use getcssvalue() method 

driver.findelement(By.Xpath("xpath_element").getcssvalue("font-size);
driver.findelement(By.Xpath("xpath_element").getcssvalue("font-colour);
driver.findelement(By.Xpath("xpath_element").getcssvalue("font-type);
driver.findelement(By.Xpath("xpath_element").getcssvalue("background-colour);