What are the keyboard shortcuts to operate a Mac slider control

What are the keyboard shortcuts to operate a Mac slider control In the Safari RSS screen, there is a slider (or range) control to change an article's summary length. By pressing TAB a couple of times, it is possible to navigate to this control, without using the mouse.
Asked by: Guest \| Views: 303

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Guest [Entry]

"Using Web Inspector (or simply view source) reveals:

<input id=""apple-rss-slider"" type=""range"" min=""0"" value=""29"" max=""100""
onmousedown=""startScale()"" onmouseup=""endScale()""
oninput=""scaleArticles(this.value)"" />

The oninput made me hope I could start typing, but it seems it's all mouse events...

Some HTML5 examples explain how to add additional spin buttons, which can be selected using Option-Tab, followed by Return to press it:

But lack of keyboard support seems an old WebKit bug: input type range broken for keyboard users.

The above example looks different in Firefox, and allows for typing a value:"