update dataset metric

README.md

@@ -10,18 +10,44 @@ tags:
 **A Benchmark for Web Accessibility Repair** 
 
 ## 😃Dataset Summary
-A11YBench consists of 60 real-world web projects, encompassing 145 web pages and 8,874 accessibility violations detected by the IBM Accessibility Checker (4.0.6).
+A11YBench consists of 60 real-world web projects, encompassing 147 web pages and 8,886 accessibility violations detected by the [IBM Accessibility Checker](https://github.com/IBMa/equal-access/tree/4.0.9) using [Check Rule 2025.09.03](https://github.com/IBMa/equal-access/tree/main-4.x/rule-server/src/static/archives/2025.09.03).
 The projects vary substantially in size, from 123 to 43,198 source files and from 3,610 to 1,555,532 lines of code, covering both lightweight documentation sites and large production-grade applications.
 This scale ensures that A11YBench reflects the structural and technical diversity of modern web ecosystems.
 
 ## 🚀Dataset Features
 
+### Dataset Split
+
 Real-world accessibility violations extracted from popular open-source web repositories.
 Multi-domain coverage including UI libraries, developer tools, cloud platforms, documentation sites, and more.
 
 Two configurations:
-A11YBench-Lite – small, quick-to-run subset (10 repos).
-A11YBench-Full – complete benchmark with all collected repositories.
+A11YBench-Lite (Repo No. 1-10) – small, quick-to-run subset (10 repos).
+A11YBench-Full (Repo No. 1-60) – complete benchmark with all collected repositories.
+
+
+### Violation Types
+
+
+
+![All 45 violation types](https://cdn-uploads.huggingface.co/production/uploads/64648f5802f8858f2128d179/1Xs_P1h8O8LRRlDVNoCwb.png)
+**Figure 1**: 45 distinct web accessibility violation types in A11YBench.
+
+![Top-15 violation types](https://cdn-uploads.huggingface.co/production/uploads/64648f5802f8858f2128d179/73ud4A-KRsHcmT5QsvGRL.png)
+**Figure 2**: Top-15 most frequent web accessibility violation types in A11YBench.
+
+A11YBench covers 45 distinct accessibility violation types, corresponding to a broad subset of WCAG rules as identified by the IBM Accessibility Checker. 
+These violation types span multiple aspects of web accessibility, including missing or redundant alternative text, insufficient text contrast, improper ARIA usage, 
+non-unique landmark or navigation labels, and missing form or input labels.
+
+As illustrated in Figure 1, the distribution of violation types exhibits a highly skewed, long-tailed pattern. 
+A small number of violation types—such as aria_content_in_landmark, svg_graphics_labelled, and text_contrast_sufficient—account for a substantial proportion of 
+all detected violations, while many other types occur less frequently. This observation highlights the uneven prevalence of accessibility issues across different 
+WCAG rules in real-world web pages.
+
+As illustrated in Figure 2, we report the top 15 most frequent violation types in the A11YBench, while the complete distribution of all 45 violation types is 
+provided in the supplementary material. Detailed definitions, detection logic, and corresponding WCAG mappings for each violation type can be found in the 
+[IBM Accessibility Checker rule set](https://github.com/IBMa/equal-access/tree/main-4.x/rule-server), which we adopt as the authoritative reference for violation semantics.
 
 ## 📃How to use it?