input checkbox true or checked or yes
checkbox, html, html-input, javascript
Solution
Only `checked` and `checked="checked"` are valid. Your other options depend on error recovery in browsers.
`checked="yes"` and `checked="true"` are particularly bad as they imply that `checked="no"` and `checked="false"` will set the default state to be unchecked … which they will not.
Problem
I've seen the three implementations of pre-selecting a checkbox. I started off using checked="checked" because I thought it was the "proper" way (never did like the "checked"="yes" however). I am thinking of changing to checked="true" as it seems more readable and is easier to code the JavaScript. Note that this same question applies to other attributes such as "disabled"="disabled" versus "disabled"="true". As long as I am consistent, is using "true" the preferred approach? Thank you ``` <input type="checkbox" checked="checked" value="123" name="howdy" /> <input type="checkbox" checked="true" value="123" name="howdy" /> <input type="checkbox" checked="yes" value="123" name="howdy" /> ```