css - html multi select option how to mark selected options? -


i using normal select , mutliselect boxes on site. should use <option selected="selected"> or <option selected> selected items ?

html5 spec:

https://www.w3.org/tr/html5/forms.html#attr-option-selected

the selected attribute boolean attribute.

http://www.w3.org/tr/html5/infrastructure.html#boolean-attributes :

the presence of boolean attribute on element represents true value, , absence of attribute represents false value.

if attribute present, value must either empty string or value ascii case-insensitive match attribute's canonical name, no leading or trailing whitespace.

conclusion:

the following valid, equivalent , true:

<option selected /> <option selected="" /> <option selected="selected" /> <option selected="selected" />

the following invalid:

<option selected="0" /> <option selected="1" /> <option selected="false" /> <option selected="true" />

the absence of attribute valid syntax false:

<option />

recommendation

if care writing valid xhtml, use selected="selected", since <option selected> invalid xhtml (but valid html) , other alternatives less readable. else, use <option selected> shorter.


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