input checkbox true or checked or yes

Question

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   lt input type  checkbox  checked  checked  value  123  name  howdy    gt   lt input type  checkbox  checked  true     value  123  name  howdy    gt   lt input type  checkbox  checked  yes      value  123  name  howdy    gt

User · Accepted Answer

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

User · Answer

Accordingly to W3C checked input s attribute can be absent ommited or have  checked  as its value  This does not invalidate other values because there s no restriction to the browser implementation to allow values like  true    on    yes  and so on  To guarantee that you ll write a cross-browser checkbox radio use checked  checked   as recommended by W3C   disabled  readonly and ismap input s attributes go on the same way   EDITED  empty is not a valid value for checked  disabled  readonly and ismap input s attributes  as warned by  Quentin

[javascript] input checkbox true or checked or yes

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