[OpenJDK 2D-Dev] <AWT Dev> [10] Review Request: 8182410, 8183508, 8181289

Jonathan Gibbons jonathan.gibbons at oracle.com
Tue Nov 14 17:16:23 UTC 2017


I read the HTML 5 spec the same as you, and we (on the Javadoc team) 
started using id on other elements, as well as <a> to provide a target 
that could be linked to.

However, the pragmatic experience was that the scrolling in some 
browsers did not completely reveal the element when there was a layered 
z component involved: the target element sometimes ended up under that 
layered component. Our experience was that the behavior was fixed when 
the target identifier was in an <a> element.

So, yes, you can follow the rules, and suggest that it is OK to put id 
on any element, and use it as a fragment identifier in a link, as given 
in the spec. Or you can be nice to your readers, and workaround what is 
probably a display bug in some browsers.

In the case of this review, you were suggesting additional "cleanup" on 
code that worked. Since there was no bug involved, and thus no inherent 
need to fix the code, my review feedback is to leave the code alone.  
You may choose to insist differently, and I cannot say that what you are 
suggesting is against the spec; I can just say that we can seen cases 
where such changes leads to bad visual effects.

-- Jon

On 10/25/17 6:31 PM, Semyon Sadetsky wrote:
> Hi Jonathan,
> On 10/24/2017 03:20 PM, Jonathan Gibbons wrote:
>> Semyon,
>> Although id is a global attribute and can be used to identify any 
>> node, some browsers do better navigation/scrolling when the id is in 
>> an <a> tag.  We have seen poor autoscrolling behavior when the id is 
>> an a header tag, such that the header ends up obscured under the 
>> navigation bar at the top of the page.
> You probably meant heading elements, because "header tag" is something 
> different. Do you have any references those issues reports? Because in 
> html5 the fragment identifiers are the only correct way to have 
> internal document bookmarks [1] [2]. If some browsers do not navigate 
> to fragment identifiers except for <a> element there must be bugs 
> reported that  which will be fixed soon.
> The html5 specification is very specific about navigating to the 
> fragment identifier [3]. So, there should no be difference between 
> navigating to "<a id=" or to any other element having id attribute. If 
> you just need an extra vertical space above header you could use css 
> style or <p>, but usage of <a> as an upper margin seems odd since it 
> is a special tag.
> --Semyon
> [1] https://www.w3schools.com/html/html_links.asp
> [2] http://www.html5-tutorials.org/html-basics/links/
> [3] https://www.w3.org/TR/html5/browsers.html#scroll-to-fragid
>> -- Jon
>> On 10/23/2017 10:08 PM, Semyon Sadetsky wrote:
>>> Hi Sergey,
>>> I see no reason to have an extra empty anchor tag to set a bookmark. 
>>> The id attribute works with any element.
>>> For example:
>>>     <a id="Definitions"></a>
>>>     <h3>Definitions</h3>
>>> should be
>>>     <h3 id="Definitions">Definitions</h3>
>>> --Semyon
>>> On 10/23/2017 02:42 PM, Sergey Bylokhov wrote:
>>>> Hello,
>>>> Please review the fix for.
>>>> 8182410: missing 'title' in 
>>>> api/javax/swing/plaf/synth/doc-files/componentProperties.html
>>>> 8183508: multi_tsc.html should be updated
>>>> 8181289: Invalid HTML 5 in AWT/Swing docs
>>>> Description:
>>>>  - Illegal characters were removed.
>>>>  - Unsupported tags/properties were removed -like <tt>, <center>, 
>>>> font, etc.(except the tags related to tables which I'll fix later).
>>>>  - HTML5 doctype is set for all files.
>>>>  - The <title> is set for all files.
>>>>  - <a name="" is replaced by <a id=""
>>> Why you replace
>>>>  - Copyrights were added to some files.
>>>> Note that I placed a <head> tag before copyright to solve errors like:
>>>> "A charset attribute on a meta element found after the first 1024 
>>>> bytes. Fatal Error: Changing encoding at this point would need 
>>>> non-streamable behavior"
>>>> specdiff: 
>>>> http://cr.openjdk.java.net/~serb/8181289/specdiff/overview-summary.html 
>>>> Bugs:
>>>> https://bugs.openjdk.java.net/browse/JDK-8182410
>>>> https://bugs.openjdk.java.net/browse/JDK-8183508
>>>> https://bugs.openjdk.java.net/browse/JDK-8181289
>>>> Webrev can be found at: 
>>>> http://cr.openjdk.java.net/~serb/8181289/webrev.00

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