⿺走巳 or ⿺走己: Can 起 be written in two different ways? Whilst typing the character 起 on my Mac, I notice that the character appears differently, illustrated in the picture below.



On some programs, the character appears with an extra stroke, on others it doesn't. I am more familiar with the character without the stroke, as I've seen in previously in textbooks.

What is the difference between the two characters (or are they the same), what is the reason for this difference and does its usage depend on different contexts?
These two are completely the same, they are just two different writing systems. 起 without a stroke is the simplified Chinese which is used in mainland China and Singapore while the character with a stroke is the traditional Chinese form which is mainly used in Taiwan and Hong Kong.



Above is an image from Baidu, it illustrates the different forms of this character in different countries and regions. From left to right is: China mainland, Taiwan, Hong Kong, Japan, South Korea and the old form (which appears in 康熙字典, a very comprehensive Chinese dictionary compiled in Qing Dynasty).