Why do some attributes require the "attr." prefix and some don't?
Angular8: What is the difference between [attr.title]='myVar' and [title]='myVar'?
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Short answer:
[title]="myVar"is property binding whereas[attr.title]="myVar"is attribute binding.Attribute binding must be used, when DOM property doesn't exist. For example,
colspandoes not exist DOM property and you must useattr.colspan="...". When you try usecolspan="..."you get an error in console. Read up on attribute binding here.