LibWeb: Support displaying HTMLInputElement placeholder values

This adds support for parsing the ::placeholder pseudo-element and injecting an anonymous layout node with that element when the input element's data is empty.
Author: https://github.com/trflynn89 Commit: 4a30446999 Pull-request: https://github.com/SerenityOS/serenity/pull/16276 Reviewed-by: https://github.com/AtkinsSJ ✅
2025-08-04 23:30:20 +00:00 · 2022-11-30 22:15:12 -05:00 · 2022-11-30 22:15:12 -05:00 · 4a30446999 · 2024-07-17 03:48:55 +09:00
commit 4a30446999
parent fddbc2e378
5 changed files with 91 additions and 0 deletions
--- a/Userland/Libraries/LibWeb/HTML/HTMLInputElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLInputElement.h
@ -66,6 +66,8 @@ public:
    String value() const;
    WebIDL::ExceptionOr<void> set_value(String);

+    Optional<String> placeholder_value() const;
+
    bool checked() const { return m_checked; }
    enum class ChangeSource {
        Programmatic,