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1. In Chrome, click the three-bar icon in the top right, then 'Bookmarks', then 'Bookmark manager'. 
2. Right-click the 'Bookmarks bar' folder and select 'Add page'. 
3. For the 'Name', put 'Hello World!', and for the URL paste in the code below. 
   
   1. javascript: alert('Hello World!');
4. To test the bookmarklet, open a new tab and click the new bookmark. 

How to launch a bookmark in Chrome with a keyboard shortcut

1. Download an unofficial Chrome extension that does this for you.
   1. Go to this link: https://github.com/courage/bookmark-shortcuts (Source)
   2. Click 'Clone or download'. Image Added
   3. Click 'Download ZIP'. Image Added
   4. Click on the .zip file when it finishes downloading. Image Added
   5. Click 'Extract all files' in the top-left of the window. Image Added
   6. Click 'Extract' in the bottom-right of the UI that appears. Image Added
   7. Drag the folder to your Desktop. Image Added
2. Enable the Chrome extension.
   1. In Chrome, click the three-bar icon in the top-right, then click 'Settings'. Image Added
   2. Click 'Extensions' in the left side-bar. Image Added
   3. Click 'Load unpacked extension' in the top-left of the main screen. Image Added
   4. In the modal that appears, navigate to Desktop → bookmark-shortcuts-master → app. Image Added
      1. Explanation: 'app' is the folder that contains the files that Chrome uses as the 'brains' of the extension.
   5. Click 'OK'.
   6. You should see the extension show up in the list of extensions. Image Added
3. Set a bookmark to be opened with a keyboard shortcut.
   1. Put the string '[Alt+1]' (including the brackets) in the title of a bookmark. (Source)
      1. If multiple bookmarks have the tag, the shortcut key will open them all. (Source)
4. Press the keyboard combination to test the bookmark.
   1. For the sake of testing, just use '[Alt+1]' in the name of a bookmark and press that combination to confirm that it works.
5. Modify the extension to