docs: OR for css and xpath selectors (#10285)

docs/src/selectors.md

@@ -503,34 +503,67 @@ await page.TextContentAsync("article:has(div.promo)");
 
 ## Selecting elements matching one of the conditions
 
-The `:is()` pseudo-class is an [experimental CSS pseudo-class](https://developer.mozilla.org/en-US/docs/Web/CSS/:is).
-It is a function that takes a selector list as its argument, and selects any element that
-can be selected by one of the selectors in that list. This is useful for writing large
-selectors in a more compact form.
+### CSS selector list
+
+Comma separated list of CSS selectors will match all elements that can be selected by
+one of the selectors in that list.
 
 ```js
 // Clicks a <button> that has either a "Log in" or "Sign in" text.
-await page.click(':is(button:has-text("Log in"), button:has-text("Sign in"))');
+await page.click('button:has-text("Log in"), button:has-text("Sign in")');
 ```
 
 ```java
 // Clicks a <button> that has either a "Log in" or "Sign in" text.
-page.click(":is(button:has-text(\"Log in\"), button:has-text(\"Sign in\"))");
+page.click("button:has-text(\"Log in\"), button:has-text(\"Sign in\")");
 ```
 
 ```python async
 # Clicks a <button> that has either a "Log in" or "Sign in" text.
-await page.click(':is(button:has-text("Log in"), button:has-text("Sign in"))')
+await page.click('button:has-text("Log in"), button:has-text("Sign in")')
 ```
 
 ```python sync
 # Clicks a <button> that has either a "Log in" or "Sign in" text.
-page.click(':is(button:has-text("Log in"), button:has-text("Sign in"))')
+page.click('button:has-text("Log in"), button:has-text("Sign in")')
 ```
 
 ```csharp
 // Clicks a <button> that has either a "Log in" or "Sign in" text.
-await page.ClickAsync(":is(button:has-text(\"Log in\"), button:has-text(\"Sign in\"))");
+await page.ClickAsync("button:has-text(\"Log in\"), button:has-text(\"Sign in\")");
+```
+
+The `:is()` pseudo-class is an [experimental CSS pseudo-class](https://developer.mozilla.org/en-US/docs/Web/CSS/:is) that
+may be useful for specifying a list of extra conditions on an element.
+
+### XPath union
+
+Pipe operator (`|`) can be used to specify multiple selectors in XPath. It will match all
+elements that can be selected by one of the selectors in that list.
+
+```js
+// Waits for either confirmation dialog or load spinner.
+await page.waitForSelector(`//span[contains(@class, 'spinner__loading')]|//div[@id='confirmation']`);
+```
+
+```java
+// Waits for either confirmation dialog or load spinner.
+page.waitForSelector("//span[contains(@class, 'spinner__loading')]|//div[@id='confirmation']");
+```
+
+```python async
+# Waits for either confirmation dialog or load spinner.
+await page.click("//span[contains(@class, 'spinner__loading')]|//div[@id='confirmation']")
+```
+
+```python sync
+# Waits for either confirmation dialog or load spinner.
+page.click("//span[contains(@class, 'spinner__loading')]|//div[@id='confirmation']")
+```
+
+```csharp
+// Waits for either confirmation dialog or load spinner.
+await page.ClickAsync("//span[contains(@class, 'spinner__loading')]|//div[@id='confirmation']");
 ```
 
 ## Selecting elements in Shadow DOM

tests/page/selectors-misc.spec.ts

@@ -271,6 +271,27 @@ it('xpath should be relative', async ({ page }) => {
   expect(await page.$eval(`div >> xpath=/*[@class="find-me"]`, e => e.id)).toBe('target2');
 });
 
+it('should work with pipe in xpath', async ({ page, server }) => {
+  await page.setContent(`
+    <span class="find-me" id=t1>1</span>
+    <div>
+      <span class="find-me" id=t2>2</span>
+    </div>
+    <div id=t3>3</span>
+  `);
+  expect(await page.$$eval(`//*[@id="t1"]|//*[@id="t3"]`, els => els.length)).toBe(2);
+
+  const e1 = await page.waitForSelector(`//*[@id="t1"]|//*[@id="t3"]`);
+  expect(e1).toBeTruthy();
+  expect(await e1.evaluate(e => e.id)).toBe('t1');
+
+  const e2 = await page.waitForSelector(`//*[@id="unknown"]|//*[@id="t2"]`);
+  expect(e2).toBeTruthy();
+  expect(await e2.evaluate(e => e.id)).toBe('t2');
+
+  await page.click(`//code|//span[@id="t2"]`);
+});
+
 it('data-testid on the handle should be relative', async ({ page }) => {
   await page.setContent(`
     <span data-testid="find-me" id=target1>1</span>