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Programming Scripts Questions
JavascriptHTMLProgramming Scripts
With JavaScript, I want to find whether a variable is ‘undefined’. The following is my code, but I am not sure about it and it checks both undefined and null:
JavascriptHTMLProgramming Scripts
I have tried the following: Using delete() isn't removing the reference value inside the variable. How can I use a variable in JavaScript?
HTMLJavascriptProgramming Scripts
With JavaScript, I want to find whether a variable is 'null' or 'undefined'. The following is my code, but I am not sure about it:
HTMLJavascriptProgramming Scripts
How to differentiate between lang and type attributes in a tag. Are they till supported and mandatory to add or is it optional to use?
JavascriptHTMLProgramming Scripts
What is the role of language attribute in tag? Is it still used in JavaScript or it is optional to use while adding a script to an HTML web page?
JavascriptHTMLProgramming Scripts
I want to remove the block inside a . How to achieve this using JavaScript? An example would work great in this situation to clear my doubt.
JavascriptHTMLProgramming Scripts
Can I add HTML comments inside … tags? If yes, then how this can be done and why it is considered as a best practice?
JavascriptHTMLProgramming Scripts
Is the usage of text/javascript still supported in a tag? When JavaScript launched, the type attribute was used in the tag. Is it still essential?
HTMLJavascriptProgramming Scripts
I am new to JavaScript. For adding JavaScript to an HTML page, we need to use the tag, but I do not know where to place the tags in HTML? How can I include JavaScript in HTML document?
HTMLCSSJavascriptProgramming Scripts
Placeholder in a hint for the element, but I want to change the input’s placeholder color. The default color is fine, but isn’t appealing. I would like to change it using jQuery. The following is my HTML form code:
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