How To Open Source Code Chrome

Open Source Code is a little like a calculator, but that’s where the similarity ends. It’s a fun little tool that you can use to get a feel for how one part of Google works. It’s an easy way to learn how Google thinks about and exposes complex applications in a very simple way.

Open Source by Default (OSbD) is an emerging cultural norm. Recently, the Chrome team explained what it takes to become OSbD compliant — and outlined some of the benefits. To help spread this movement, we thought it would be useful to collect all the information in one place. Specifically, this cheat sheet aims to be:

Google Chrome

To view the source code of a web page in Google Chrome, use any of the following methods.

View source code only

Method one

To view only the source code, press Ctrl+U on your computer’s keyboard.

Method two

Right-click a blank part of the web page and select View page source from the pop-up menu that appears.

View page source in Chrome.

View page source with elements

  1. Open Chrome and navigate the web page whose source code you’d like to view.
  2. Click the Customize and control Google Chrome Chrome settings icon icon in the upper-right corner of the browser window.
  3. From the drop-down menu that appears, select More tools, then select Developer tools.
  4. Click the Elements tab in the top-left corner of the new section that appears at the bottom of the screen.
Elements tab in Chrome.

Tip

In Chrome, pressing F12 or Ctrl+Shift+I also brings up the interactive developer tool. This tool provides much more interaction with the source code and CSS settings, allowing users to see how changes in the code affect the web page immediately.

Chrome, Firefox, Edge, and Internet Explorer

  1. 1Open your web browser. The process for viewing source code on Chrome, Firefox, Microsoft Edge, and Internet Explorer is the same.
  2. 2Navigate to a webpage. It should be a page whose source code you wish to view.
  3. 3Right-click the page. If you’re using a Mac computer with a one-button mouse, you can hold down Control and click instead. If you are on a laptop with a trackpad, you can use two fingers to click the page instead. This will invoke a drop-down menu.
    • Don’t right-click a link or a photo when doing this or else the wrong menu will appear.
  4. 4Click View page source or View Source. Doing so will display your browser’s source code in a new window or at the bottom of the current window.
    • You’ll see View page source for Chrome and Firefox, and View Source for Microsoft Edge and Internet Explorer.
    • You can also press Ctrl+U (PC) or ⌥ Option+⌘ Command+U (Mac) to display the source code.

How to See the HTML Code for a Website

By AllenBethea

template page

Frame-based websites often display their frameset layout rather than the content.Image Credit: vetkit/iStock/Getty Images

The underlying HTML code used to build a website is not hidden but readily accessible to anyone with the proper tools. For example, Web browsers such as Firefox, Chrome, Safari, Opera and Internet Explorer have multiple ways you can view a website’s HTML, CSS or JavaScript code directly. In addition, some dedicated Web developer tools can load and open a Web page from the Internet like a file stored on a local disk.

View Source in Browser

The steps required to see a website’s HTML code are essentially the same for Firefox, Chrome, Safari, Opera and Internet Explorer. Right-click a section of a Web page that contains only text and then select the “View Source” or “View page source” option. Depending on your browser setup, the HTML code opens in a new browser tab or in a separate application window.

Save Source Code to Disk

If you need to examine or edit a website’s code later, you can save the page to your hard drive. When you right-click a Web page in Firefox or Safari, you are offered the option to “Save Page As.” Chrome and Opera have the “Save as” option. To save a Web page using Internet Explorer, click “Tools,” “File,” and then “Save as.” In addition to the Web page itself, the browser saves all the images, CSS files and JavaScript the page uses that are stored locally on its Web server.

Built-in Browser Developer Tools

Firefox, Chrome, Opera and Internet Explorer each provide a developer mode that enables you to simultaneously view a rendered Web page and its HTML, CSS and JavaScript code. If you click an element on the Web, its code appears in the developer display panel. The developer panel can be accessed through the options or configuration tool. While Safari does not have a native developer tool, you can install one as an extension.

Web Developer Applications

Website design tools like Dreamweaver, Kompozer and Microsoft Expressions enable you to open an online Web page using its URL. You view the HTML code in a source code-only view or a split, preview and source view. In addition, you can edit the code and view the changes in real time. The actual code stored on the website’s server is never changed.

Issues You May Encounter

Intentionally or unintentionally, some websites do not give up their HTML code easily. For example, some sites use JavaScript code, which blocks right-clicks. You can still view the source code by downloading the page to your disk or by disabling JavaScript in your browser. Other sites use HTML frames or iframes, which prevent you from directly accessing their source. Firefox, Chrome, Safari and Opera detect frame-based websites and automatically offer you an option to view a frame’s source code. If a Web page uses a JavaScript or CSS file stored on another domain, you can view that file’s code directly by copying its URL from the HTML code you can access and then pasting it into the address bar of a new browser tab.

How to view the HTML code of a particular page element?

Instead of viewing the HTML code of a whole page, you can view the code of particular page elements using the INSPECT ELEMENT option available in all popular browsers like Google Chrome, Firefox, and Safari.

The process is straightforward. Open the page in a new browser window and then highlight a section of the page using the mouse.

Right-click and then select INSPECT from the dropdown menu.

This will open the developer tools and show you the HTML code associated with the particular element or page section.

Here is a quick demo on how to do this using Google Chrome.

View the code of a page element using INSPECT.

How to Check Null Value in JavaScript

By Lysis

...

You can check for null values in JavaScript.

Using null parameters in JavaScript allows programmers to define a variable without assigning a value to it. Null values are used in simple variables like integers and strings, and they are used for objects on a Web page. However, null values become troublesome for calculations or object manipulation. If you have a defined variable in your code, checking for null values prior to executing code limits the number of errors.

Step 1

Declare the variable. Type the following into your JavaScript code:

var myVal = null;

This allocates memory and defines the variable for use.

Step 2

Evaluate whether the variable is null. In some instances, you may want to execute code if the value is null. Wrap your executable code with this statement:

if (myVal== null) {

}

This statement provides a way to execute code only if myVal is null.

Mozilla Firefox

To view the source code of a web page in Mozilla Firefox, use any of the following methods.

View source code only

Method one

To view only the source code, press Ctrl+U on your computer’s keyboard.

Method two

Right-click a blank part of the web page and select View Page Source from the pop-up menu that appears.

View page source in Firefox.

View page source with elements

  1. Open Firefox and navigate the web page whose source code you’d like to view.
  2. Click the Menu Firefox Menu Icon icon in the top-right corner of the screen.
  3. Select Web Developer in the drop-down menu, then select Toggle Tools from the expanded menu.
  4. Click the Inspector tab in the top-left corner of the section that appears at the bottom of the screen.
Firefox Inspector tab.

Tip

In Firefox, pressing F12 or Ctrl+Shift+I also brings up the interactive developer tool. This tool provides interaction with the source code and CSS settings, allowing users to see how changes in the code affect the web page in real time.

View a section of the page’s source code

  1. Highlight the portion of a web page for which you’d like to view the source code.
  2. Right-click that highlighted section and select View Selection Source.

Tip

You can use the Firebug add-on to view and edit the source code of a page, and view the changes live through the browser.

Microsoft Edge

To view the source code of a web page in Microsoft Edge, use any of the following methods.

View source code only

Method one

To view only the source code, press Ctrl+U on your computer’s keyboard.

Method two

Right-click a blank part of the web page and select View page source from the pop-up menu that appears.

View page source selector in Edge.

View page source with elements

  1. Open Microsoft Edge and navigate the web page whose source code you’d like to view.
  2. Click the Settings and more Edge more icon icon in the upper-right corner of the screen.
  3. Move your mouse over More tools in the drop-down menu, and select Developer tools from the expanded menu.
  4. Click the Elements tab at the top of the window that appears on the right side of the screen.
Elements tab in Edge.

Tip

In Microsoft Edge, pressing F12 or Ctrl+Shift+I also brings up the interactive developer tool. This tool provides interaction with the source code and CSS settings, allowing users to see how changes in the code affect the web page in real time.

Conclusion

This book is a hacker’s path through the world of Google Chrome. It’s more than just an adventure story; it’s meant to be a way for someone who knows little about web development or programming to get started with web development and programming using Google Chrome.

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