Open
Description
System details
Output of sessionInfo():
R version 3.6.3 (2020-02-29)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Catalina 10.15.4
Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRlapack.dylib
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] shiny_1.4.0.9002
loaded via a namespace (and not attached):
[1] Rcpp_1.0.4.6 withr_2.1.2 packrat_0.5.0 digest_0.6.25 later_1.0.0
[6] mime_0.9 R6_2.4.1 jsonlite_1.6.1 xtable_1.8-4 magrittr_1.5
[11] rlang_0.4.5 promises_1.1.0 tools_3.6.3 tinytex_0.22 rsconnect_0.8.16
[16] httpuv_1.5.2 xfun_0.13 fastmap_1.0.1 compiler_3.6.3 htmltools_0.4.0.9003
Example application or steps to reproduce the problem
Using the default app created by RStudio IDE 1.3.947, but specifically looking at:
sliderInput("bins",
"Number of bins:",
min = 1,
max = 50,
value = 30)
Describe the problem in detail
Load the page into browser, and try to use the slider via keyboard-only.
The slider control is completely inaccessible. You cannot get focus to it via keyboard (e.g. by Tab key), thus you cannot manipulate it via keyboard. Similarly, it is not annotated in a way that permits screen readers to recognize it as a slider, nor to manipulate it.
This violates numerous WCAG 2.1 level A requirements.
https://www.w3.org/TR/WCAG21/#keyboard-accessible
Expected
- slider should be reachable via Tab sequence (i.e. tabindex=0)
- the slider should implement the aria 'slider' role both in markup and behavior:
https://www.w3.org/TR/wai-aria-practices/#slider