Extra Attributes via htmltools
In shiny.webawesome: 'shiny' Bindings for 'Web Awesome' Components

Overview

One of Web Awesome's strengths is that its components behave like standard HTML elements.

That matters in shiny.webawesome too. Even though the package provides R wrappers for Web Awesome components, the rendered output is still HTML. In practice, that means the components can still participate in normal HTML attribute patterns.

Examples of standard attributes you may still want to apply include:

title
role
tabindex
aria-label
aria-describedby
lang
data-* attributes for app- or browser-side hooks

Why the wrappers do not expose every HTML attribute

The generated wrappers intentionally keep their argument surface focused.

For all components, the wrappers expose the most broadly useful HTML-level attributes directly:

class
style

This keeps the package API smaller and easier to understand. If every wrapper also exposed the full standard HTML attribute surface, the generated API would grow substantially without adding much package-specific value.

The design goal is:

expose the Web Awesome component API clearly
expose the most useful common HTML hooks directly
avoid wrapper-argument bloat for attributes that already belong to normal HTML authoring

Adding extra attributes

When you need standard HTML attributes beyond class and style, append them with htmltools.

This works because the generated wrappers return normal HTML tag objects.

Example: accessibility and tooltip attributes

library(htmltools)
library(shiny.webawesome)

button_with_attrs <- tagAppendAttributes(
  wa_button("save_button", "Save"),
  `aria-label` = "Save current form",
  title = "Save"
)

cat(as.character(button_with_attrs), sep = "\n")

Here is the same attribute pattern in a minimal Shiny app:

library(htmltools)
library(shiny)
library(shiny.webawesome)

ui <- webawesomePage(
  title = "Extra attributes",
  tagAppendAttributes(
    wa_button("save_button", "Save"),
    `aria-label` = "Save current form",
    title = "Save"
  )
)

server <- function(input, output, session) {}

shinyApp(ui, server)

Here, wa_button() stays focused on the component API while htmltools provides the extra HTML attributes.

Example: role, tabindex, and custom data attributes

library(htmltools)
library(shiny)
library(shiny.webawesome)

ui <- webawesomePage(
  title = "More attributes",
  tagAppendAttributes(
    wa_card("Keyboard focus example"),
    role = "region",
    tabindex = "0",
    `data-section` = "summary"
  )
)

server <- function(input, output, session) {}

shinyApp(ui, server)

This is especially useful when:

you need accessibility attributes
you need browser-side hooks for app-local JavaScript
you need standard HTML semantics that are not worth surfacing as dedicated wrapper arguments

When to use this pattern

Prefer direct wrapper arguments when the package already exposes the attribute or component field intentionally.

Prefer tagAppendAttributes() when:

the attribute is part of normal HTML rather than a Web Awesome-specific API
the attribute is app-specific rather than package-wide
adding a dedicated wrapper argument would add API noise without improving the common case

Relationship to other package surfaces

This pattern is separate from:

generated Shiny bindings
generated update helpers
the command-layer helpers such as wa_set_property() and wa_call_method()

Use htmltools attribute appending when you are shaping static rendered HTML. Use the command layer when you need live browser-side interaction after the UI has already been rendered.