web component - Polymer hostAttributes Error -

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i have been following along polymer 1.0 developer guide , stumbled when getting specific part hostattributes.

when take example code docs:

hostattributes: {   string-attribute: 'value',   boolean-attribute: true   tabindex: 0 }

and add prototype, browser keeps throwing error:

uncaught syntaxerror: unexpected token -

on lines there dashes. strangely, when put quotes around string-attribute , boolean-attribute, renders fine.

is error on part or error in docs somehow?

in way example represented string-attribute, string-attribute refers string attribute should set on label of element declaration. also, may have noticed way declaring string-attribute in example, javascript assumes string-attribute variable, , variables can not declared "my-variable" declared "myvariable", strings together.
think that's reason why should declared follows: 

hostattributes: {   "my-var": 'value',// javascript assumes my-bar string   my-var-two: 'value'// javascript assumes my-bar-two variable (this fail)   tabindex: 0 }

i hope have understood me, english bad.

edit

if custom elements needs html attributes set on @ create-time, these may declared in hostattributes property on prototype, where keys attribute name , values values assigned. values should typically provided strings, html attributes can strings; 

hostattributes: {   string-attribute: 'value', //string-attribute key, should inside "" because javascript's keys doesn't accepts "-"   boolean-attribute: true//will fail because not key   tabindex: 0//this works because javascript correct key }

...however, the standard serialize method used convert values strings, true serialize empty attribute, , false result in no attribute set, , forth

as can realize, serialized string values, never mentioned keys serialized string well. mentioned before, english bad , understood that.


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