There is not really a straightforward way of getting the HTML source code of a webelement. You will have to use JavaScript. I am not too sure about python bindings, but you can easily do like this in Java. I am sure there must be something similar to JavascriptExecutor class in Python.

 WebElement element = driver.findElement(By.id("foo"));
 String contents = (String)((JavascriptExecutor)driver).executeScript("return arguments[0].innerHTML;", element);

I hope this could help:
http://selenium.googlecode.com/svn/trunk/docs/api/java/org/openqa/selenium/WebElement.html

Here is described Java method:

java.lang.String    getText() 

But unfortunately it’s not available in Python. So you can translate the method names to Python from Java and try another logic using present methods without getting the whole page source…

E.g.

 my_id = elem[0].get_attribute('my-id')

WebElement element = driver.findElement(By.id("foo"));
String contents = (String)((JavascriptExecutor)driver).executeScript("return arguments[0].innerHTML;", element); 

This code really works to get JavaScript from source as well!

Sure we can get all HTML source code with this script below in Selenium Python:

elem = driver.find_element_by_xpath("//*")
source_code = elem.get_attribute("outerHTML")

If you want to save it to file:

with open('c:/html_source_code.html', 'w') as f:
    f.write(source_code.encode('utf-8'))

I suggest saving to a file because source code is very very long.

Using the attribute method is, in fact, easier and more straightforward.

Using Ruby with the Selenium and PageObject gems, to get the class associated with a certain element, the line would be element.attribute(Class).

The same concept applies if you wanted to get other attributes tied to the element. For example, if I wanted the string of an element, element.attribute(String).

In Ruby, using selenium-webdriver (2.32.1), there is a page_source method that contains the entire page source.

If you are interested in a solution for Selenium Remote Control in Python, here is how to get innerHTML:

innerHTML = sel.get_eval("window.document.getElementById('prodid').innerHTML")

It looks outdated, but let it be here anyway. The correct way to do it in your case:

elem = wd.find_element_by_css_selector('#my-id')
html = wd.execute_script("return arguments[0].innerHTML;", elem)

or

html = elem.get_attribute('innerHTML')

Both are working for me (selenium-server-standalone-2.35.0).

And in PHPUnit Selenium test it’s like this:

$text = $this->byCssSelector('.some-class-nmae')->attribute('innerHTML');

Java with Selenium 2.53.0

driver.getPageSource();

InnerHTML will return the element inside the selected element and outerHTML will return the inside HTML along with the element you have selected

Example:

Now suppose your Element is as below

<tr id="myRow"><td>A</td><td>B</td></tr>

innerHTML element output

<td>A</td><td>B</td>

outerHTML element output

<tr id="myRow"><td>A</td><td>B</td></tr>

Live Example:

http://www.java2s.com/Tutorials/JavascriptDemo/f/find_out_the_difference_between_innerhtml_and_outerhtml_in_javascript_example.htm

Below you will find the syntax which require as per different binding. Change the innerHTML to outerHTML as per required.

Python:

element.get_attribute('innerHTML')

Java:

elem.getAttribute("innerHTML");

If you want whole page HTML, use the below code:

driver.getPageSource();

The method to get the rendered HTML I prefer is the following:

driver.get("http://www.google.com")
body_html = driver.find_element_by_xpath("/html/body")
print body_html.text

However, the above method removes all the tags (yes, the nested tags as well) and returns only text content. If you interested in getting the HTML markup as well, then use the method below.

print body_html.getAttribute("innerHTML")

This works seamlessly for me.

element.get_attribute('innerHTML')

The other answers provide a lot of details about retrieving the markup of a WebElement. However, an important aspect is, modern websites are increasingly implementing JavaScript, ReactJS, jQuery, Ajax, Vue.js, Ember.js, GWT, etc. to render the dynamic elements within the DOM tree. Hence there is a necessity to wait for the element and its children to completely render before retrieving the markup.

Python

Hence, ideally you need to induce WebDriverWait for the visibility_of_element_located() and you can use either of the following Locator Strategies:

• Using get_attribute("outerHTML"):

  element = WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "#my-id")))
  print(element.get_attribute("outerHTML"))
  

• Using execute_script():

  element = WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "#my-id")))
  print(driver.execute_script("return arguments[0].outerHTML;", element))
  

• Note: You have to add the following imports:

  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.common.by import By
  from selenium.webdriver.support import expected_conditions as EC
  

Use execute_script get html

bs4(BeautifulSoup) also can access html tag quickly.

from bs4 import BeautifulSoup
html = adriver.execute_script("return document.documentElement.outerHTML")
bs4_onepage_object=BeautifulSoup(html,"html.parser")
bs4_div_object=bs4_onepage_object.find_all("atag",class_="attribute")

In current versions of php-webdriver (1.12.0+) you have to use

$element->getDomProperty('innerHTML');

as pointed out in this issue: https://github.com/php-webdriver/php-webdriver/issues/929

In PHP Selenium WebDriver you can get page source like this:

$html = $driver->getPageSource();

Or get HTML of the element like this:

// innerHTML if you need HTML of the element content
$html = $element->getDomProperty('outerHTML');

Updated 2022 Selenium Retrieving HTML

To start with, download the Python bindings for Selenium WebDriver.

• One can do this from the PyPI page for the Selenium package.
• Alternatively, one can use pip to install the Selenium package. Python 3.6 provides the pip in the standard library.

Method 1

Read the innerHTML attribute to get the source of the element’s content. innerHTML is a property of a DOM element whose value is the HTML between the opening tag and ending tag.

For example, the innerHTML property in the code below carries the value “text”

<p>
a text
</p>

element.get_attribute('innerHTML')

Method 2

Read the outerHTML to get the source with the current element. outerHTML is an element property whose value is the HTML between the opening and closing tags and the HTML of the selected element itself.

For example, the code’s outerHTML property carries a value that contains div and span inside that.

<div>
<span>Hello there!</span>
</div>

ele.get_atrribute("outerHTML")