JavaScript Variable Declaration

Declaring Variables in JavaScript

• Variable y can be declared with the keyword var and assigned a string value, such as "hello".
• Variable x can be declared with the keyword var and assigned a numeric value, such as 5.
• Identifier 1z is not a valid variable name in JavaScript, as it starts with a number.
• There is no such keyword as Ovar in JavaScript to declare a variable, so D-Ovar a is an invalid declaration.

JavaScript Variables

• var 1z = true is not a valid way to declare a variable in JavaScript.
• Valid variable declarations include var y = "hello" and var x = 5.

JavaScript String Concatenation

• The correct way to use the concatenation operator to combine two strings is "Hello " + "world".

JavaScript If-Else Statements

• The syntax for an if-else statement is if (condition) { code block } else { code block }.

CSS Units of Measurement

• lb is not a valid unit of measurement in CSS.
• Valid units of measurement in CSS include cm, px, em, and others.

Browser Preferences

• Users can set their own browser preferences, making True the correct answer.

HTML Headings

• The most important heading should be marked up as h1.
• Headings in HTML should follow a hierarchical structure, with h1 being the most important and h6 being the least important.