Difference between verifying if a image is displayed vs loaded on a webpage?

selenium verify image is displayed
how to verify image present in selenium webdriver
how to verify image present in selenium webdriver python

I was asked to verify if a background-image is loaded to the webpage, but I don't really understand the difference between an image being loaded vs displayed. Is there? If so, how does one code for this test in a selenium java?

Below is the code I am trying to assert, first by checking that the url contains the file I am expecting, and then the part I don't know how to verify, checking if the file is loaded on the webpage or not.

Code:

<div class="_1WvEu" style="background-image: url(&quot;/resources/defaults/news_3.0/icons/weather/wi-67.svg&quot;);"><p class="_1DlTY"> Now </p><p class="_1Q1wt _1L3iW">62</p></div>

Assert 1:

assertTrue(thePageFactory.getAudHomePage(this).WeatherTopNavContainer.findElement(By.xpath("div[1]")).getAttribute("style").contains("/resources/defaults/news_3.0/icons/weather/wi-67.svg"),"File does not match for widget #1");

Assert 2:

?

Verify the url path alone will not find the image not loading issue. If the image is not accesible or image not present in the server, this will not fail for those case.

If it is an image tag, we can verify its height to check whether it is loaded or not. As it is background image, we cannot use that criteria here as well.

But using javascript, you can validate whether the image url is loading an image or not. This is will give you additional valition that your image is loaded.

class image_loaded(object):
  javascript= """var image = document.createElement('img');
   image.src = getBgUrl(document.getElementById('test-bg'));
   image.onload = function () {
     return true
   }; ."""
  def __init__(self, locator):
    self.url= url

  def __call__(self, driver):
    return  driver.execute_async_script(javascript,)


wait = WebDriverWait(driver, 60)
# get extract the image url from the style attribute with string manipulation
element = wait.until(image_loaded("the image url present in background"))

Verifying if an image Is displayed on a webpage, If you are testing for a specific image at a specific resolution then you could either compare the image with the reference image or quicker calculate the MD5 of  Unlike the visibility property, which leaves an element in normal document flow, display: none essentially removes the element completely from the document. The attached element does not take up any space, even though it's still in the source code.

To verify that image is loaded or not use below code.

It will check the HTTP status of any url.

You can give url given in background-image style property or url given in href attribute of IMG tag

HttpClient client = new DefaultHttpClient();
HttpGet request1 = new HttpGet("provide-url-here");
HttpResponse response1 = client.execute(request1);
int code = response1.getStatusLine().getStatusCode();

If HTTP Status(value of variable code in above code snippet) is 2×× (in most cases 200), that means url is working fine and image is loaded properly

Journal on Data Semantics I, In the shown DQF file, some general information are associated to the home page of a web site related to a researcher (lines 5-10). as an image showing the evolution in time of the completeness of the curriculum vitae. page is completely loaded, DQViewer asks IE for the HTML source code, and verifies if the page has  The major difference between the two is the content. While a webpage offers information on a topic, a website offers a great deal of information about the topic (Considering the website is focused on its topic which is normally the case). Aside from the information given by a webpage, a website can offer many more options such as signup page, subscribe, contact page, news page, more information, etc.

Of-coarse there is a difference between the two states of an image being loaded vs displayed.

Factually, it's not the image alone but the entire webpage (i.e. Page Object) that gets loaded.

You can find a relevant detailed discussion in Do we have any generic funtion to check if page has completely loaded in Selenium

isDisplayed()

isDisplayed() method validates if the element is displayed or not. This method avoids the problem of having to parse an element's style attribute and is defined as:

boolean isDisplayed()
Is this element displayed or not? This method avoids the problem of having to parse an element's "style" attribute.

Returns:
Whether or not the element is displayed
This usecase

As per the HTML it seems the element is a React element so before assering you need to lookout for the element inducing WebDriverWait as follows:

WebElement element = new WebDriverWait(driver, 20).until(ExpectedConditions.visibilityOfElementLocated(By.xpath("div[1]")));

Hardware and Software: Verification and Testing: 13th , Loaded synchronously, the outcome of this check will always be negative. Our goal is to analyze a web page and add defer tags to scripts, wherever possible. Concretely, when loading and displaying the page, the browser constructs a of certain event sources (e.g., form fields or onload properties of images) with  Gallery Pages and Project Pages use the same interface for loading images. The main difference between them is how they display. On Project Pages, the image title and description text display on the page beside or below the image. Gallery Pages and Project Pages also have different style options within the Site Styles panel.

Proceedings of the International Workshop on Computational , Pages loaded: 1 Investigator Investigators are assigned to the case when it is created. A page is displayed where you indicate the image path (manually) and specify you to create an verification MD5 hash of the file and to verify it on request. of Autopsy and PTK (Table 1) highlights the difference on the interface level,  Change the text indicated in red to the message you would like to display. Although you can use the above HTML code to display an alert box when your web page loads, please use it cautiously, as you don't want to irritate your visitors.

Professional JavaScript for Web Developers, NOTE There is a significant difference between the way browsers handle errors will fail to load In this example, an alert is displayed when the image fails to load. cause a web page to become unusable, understanding when and why errors Since JavaScript is loosely typed and function arguments aren't verified, there  In the digital age, it is important to know the difference between these terms, even though they are often interchangeable in informal speech. A web page is a single document on the Internet. A website is a collection of many web pages linked together under one domain.

Verify Element Present, waitFor, andWait in Selenium IDE, We can use following two commands to verify the presence of an element: Waits, Verify Element Present/Visible in Selenium IDE true before proceeding to the next command (irrespective of loading of a new page). to be used on AJAX-based dynamic websites that change values and elements  A web page or a webpage is a specific collection of information provided by a website and displayed to a user in a web browser. A website typically consists of many web pages linked together in a coherent fashion. The name "web page" is a metaphor of paper pages bound together into a book