According to the HTML5 spec:

The values "true" and "false" are not allowed on boolean attributes. To represent a false value, the attribute has to be omitted altogether.

• https://www.w3.org/TR/html5/infrastructure.html#boolean-attributes

So, in order to make my code spec compatible, i'd do in this way in vue: <input :checked="checked ? '' : false">, do you think it is necessary to directly support boolean attributes in vue? @yyx990803

Solutions I can think of are these:

• By another directive: v-add:selected="true" (not recommand)
• By modifier: v-bind:selected.boolean="true" (recommand)
• Auto: v-bind:selected="true", we need to mantain a boolean attribute list(see), and this may have compatibility problems.

Again, if you think it is necessary, let me handle this!