In Ontario, a holograph will is a will that is done entirely in your own handwriting, and signed and dated at the end. However, it must be entirely in your own handwriting – one typed word can make the entire will invalid.
In Australia, a will on an iPhone has been ruled to be valid. A young man typed out a will on the notes app of his phone moments before taking his life. His brother, named as executor, applied to have the court determine if the will was valid; in the circumstances, the judge approved the digital will as a valid holograph will. This echoes a decision from some time ago about a will being valid when written on a computer.
As we move further into the digital age, we will need to examine what, exactly, counts as a will.