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  1. Get and Check variable type in JavaScript
  2. Add dynamically button to scroll to top of the page
  3. Multiple Select Dropdown List with JavaScript
  4. Extract a number of characters and words from string
  5. Highlight selected, clicked word in page
  6. Dynamic variables in JavaScript
  7. Using Variable and Function with Name from String in JavaScript
  8. Add Pause in JavaScript script
  9. Validate radio and checkbox buttons
  10. Add and Delete options in Select list using JavaScript
  11. Check and Validate characters in form fields
  12. Display / Simulate a Loading Progress Bar
  13. Get and change IFrame content through a JavaScript script created in another IFrame
  14. Get and Modify content of an Iframe
  15. Make HTML elements the same height
  16. Check the file type before Upload
  17. Rounded corners in Internet Explorer
  18. Rotate HTML objects, Div, Span, images with jQuery
  19. setTimeout and this in class function in JavaScript
  20. setTimeout and setInterval in JavaScript
  21. this and target in JavaScript Events
  22. defineProperty and defineProperties
  23. Get CSS property value with JavaScript /jQuery
  24. Drag and Drop with HTML5 attributes
  25. insertAdjacentHTML - Insert content at a specified position
  26. innerHTML and outerHTML to Get and Replace HTML content

Daily Test with Code Example

Which attribute is used in <a> tag for the address of the link?
src href rel
<a href="" title=""></a>
Which CSS property sets the type of the text font?
font-family text-decoration font-size
h2 {
What instruction selects all the <div> tags with class="cls"?
querySelector("div.cls") getElementsByTagName("div") querySelectorAll("div.cls")
var elm_list = document.querySelectorAll("div.cls");
var nr_elms = elm_list.length;       // number of selected items
Indicate the function that can be used to get the sum of values in an array.
array_sum() array_diff() array_shift()
$arr = array(1, 2, 3, 4);
$arr_sum = array_sum($arr);
echo $arr_sum;       // 10
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