Now I understand. Thanks for your patience in explaining this to me. -- Regards, Ivan Kotenkov 12.09.2013, Χ 18:20, Boris Zbarsky <bzbarsky@MIT.EDU> ΞΑΠΙΣΑΜ(Α): > On 9/12/13 4:15 AM, Ivan Kotenkov wrote: >> http://www.w3.org/TR/WebIDL/#dfn-read-only . >> "The attribute is read only if the readonly keyword is used before the >> attribute keyword. > > This is talking about IDL attributes (properties of the JS object) > >> I think, using setAttribute is a direct assignment > > setAttribute sets a _content_ attribute, not an IDL attribute. Please read up on the difference between the two. > >> Next let's look at an example. As a developer of chromium-based browser >> I'll use chromium code as an example. >> /interface HTMLInputElement/ is defined in HTMLInputElement.idl. Among >> other attributes it has >> /readonly attribute boolean willValidate;/ > > Right, but it doesn't have a defined "willvalidate" content attribute at all. As in, <input willvalidate="something"> has no efeect whatsoever. > >> Now let's create a simple webpage that will try to change the attribute: > >> / input = document.getElementById('inp');/ >> / alert(input.willValidate);/ >> / input.setAttribute('willValidate', false);/ >> / alert(input.willValidate);/ > > That's because the content "willValidate" attribute and the IDL "willValidate" attribute are completely unrelated. Try getAttribute("willValidate") after your setAttribute call. > >> Also, grepping the *.idl files for 'readonly' gives us attributes that >> obviously should not be change by using setters, for example: >> /HTMLFormElement.idl: readonly attribute HTMLCollection elements;/ >> /HTMLFormElement.idl: readonly attribute long length;/ > > Those don't correspond to content attributes either. > > But the attribute we're discussing here _does_ correspond to a content attribute. <script lazyload> is supposed to change the behavior of the <script>. > > Again, the real problem the spec has here is that it doesn't actually define the behavior of the "lazyload" IDL attribute. It needs to do that. > > -Boris
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