css - Why string assignment in javaScript is case insensitive? -
i have create simple html page 1 button change color when clicked: <!doctype html> <html> <head> <title></title> </head> <body> <button onclick="if (this.style.backgroundcolor == 'red') { this.style.backgroundcolor = 'green' } else { this.style.backgroundcolor = 'red' } alert(this.style.backgroundcolor)"> ok </button> </body> </html> it surprising me alert(this.style.backgroundcolor) return red instead of red . why? there assignment this.style.backgroundcolor = 'red' , in red start capital letter. css styles aren't saved literal strings, they're converted internal, canonical representation of style. color styles case-insensitive, , canonical representation lowercase.
