docs(recipe): scroll to load more (infinite scroll)

docs-site/docs/recipes/scroll-to-load-more.md

@@ -0,0 +1,48 @@
+---
+description: "Test infinite scroll in Selenium: scroll to the bottom, then assert the new items appear with a retrying count check instead of Thread.sleep."
+id: scroll-to-load-more
+title: Scroll to load more
+sidebar_label: Scroll to load more
+---
+
+# Scroll to load more
+
+Infinite-scroll pages fetch the next batch only after you reach the bottom, and the new items arrive a moment later. A `Thread.sleep` is either too short (flaky) or too long (slow). Scroll with `BasePage`, then assert on the item count. `assertThat(...).count(n)` retries until it matches or `timeouts.explicit` runs out.
+
+```java title="FeedPage.java"
+import com.seleniumboot.test.BasePage;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebDriver;
+
+import static com.seleniumboot.assertion.SeleniumAssert.assertThat;
+
+public class FeedPage extends BasePage {
+
+    private static final By ITEMS = By.cssSelector("#feed .item");
+
+    public FeedPage(WebDriver driver) {
+        super(driver);
+    }
+
+    public int itemCount() {
+        return driver.findElements(ITEMS).size();
+    }
+
+    public void loadMore(int batchSize) {
+        int before = itemCount();
+        scrollToBottom();
+        assertThat(ITEMS).count(before + batchSize);   // retries until the batch lands
+    }
+}
+```
+
+```java
+feed.loadMore(10);   // 10 -> 20 items
+feed.loadMore(10);   // 20 -> 30 items
+```
+
+Record the count **before** you scroll, so the assertion is relative to what was there. That keeps it correct no matter how many times you call it.
+
+If the loader is triggered by a specific element (a "sentinel" or the last row) rather than the page bottom, use `scrollTo(By)` on that element instead of `scrollToBottom()`. It scrolls the element into view.
+
+**Deeper reference:** [BasePage](/docs/guides/base-page): the page-object base class with the scroll helpers.

docs-site/sidebars.js

@@ -64,6 +64,7 @@ const sidebars = {
         'recipes/handle-iframes',
         'recipes/handle-new-windows',
         'recipes/handle-javascript-alerts',
+        'recipes/scroll-to-load-more',
         'recipes/drag-and-drop',
         'recipes/handle-shadow-dom',
         'recipes/read-table-rows',