RFR: 8344301: Refine stylesheet for API docs [v5]

[Chen Liang]

On Fri, 7 Mar 2025 09:20:31 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

>> This is an extensive update to the JavaDoc stylesheet that focuses on layout and typography, with the purpose of making API docs easier to read and use.
>> 
>> List of changes:
>> 
>>  - Slightly increase text and navigation fonts to improve readability and to better match the code font (which remains unchanged). 
>>  - Fix font size and line height inconsistencies in many places.
>>  - Limit the maximal width of page content to improve readability on large displays. If more horizontal space is available, page content is centered.
>>  - Remove light gray section background in class and module pages to simplify and unclutter the layout. 
>>  - Add a subtle gray background to code elements in normal text to set them apart.
>>  - Highlight headings of member details when they are used as link targets.
>>  - Reserve use of bold font in member summary tables to element names to make them easier to spot and reduce visual noise.
>>  - Slightly reduce width of TOC sidebar and use ellipsis (...) if content does not fit (but long signatures continue to wrap).
>>  - Make method signatures in details easier to read on small dispays by allowing them to wrap before parameters and throws sections.
>>  - Make tabs on top of summary tables scroll instead of wrapping if they overflow the available horizontal space.
>>  - Hide TOC sidebar and copy-to-clipboard buttons in addition to the top navigation bar when printing a page.
>>  - Improve styling of additional HTML files in `doc-files` directories.
>>  - Reduce rollover animations and remove smooth scrolling in order to improve accessibility.
>>  - Add background to `<pre>` elements (will look great with [JDK-8346118](https://bugs.openjdk.org/browse/JDK-8346118)).
>>  - Various cleanup.
>> 
>> There are too many non-trivial changes in the stylesheet to try explaining them here, but of course I'll be happy to discuss every change on request.
>> 
>> [Full JDK API docs are available for testing and comparison](https://cr.openjdk.org/~hannesw/8344301/api.05/index.html).
>
> Hannes Wallnöfer has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review feedback: merge duplicate selectors

Looks good in a chromium browser.

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23678#pullrequestreview-2668311862