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Here is the HTML for this: This text is an example of an H1 heading is the smallest, with to of varying sizes in between them. is the largest size heading, which you would normally use at the start of a document. In most cases, the first heading on a web page will be the same as, or similar to, the document title to let people know right off what the page is about. If you think about a HEADING as part of an outline of a document, the first HEADING () tag is roman numeral one, a second level heading () would be roman numeral two, and so on. Generally, the first line of an HTML page will be a HEADING tag. Now we are ready to start creating the true content of the web page by putting information between the tags. There are very few HTML tags that don't require a closing tag, so be sure you get into the habit of closing your tags. You need to be very careful about closing your HTML tags. The second one,, has a / (this is called a forward slash). Do you see the difference? The first one,, has no / (forward slash). Notice that all the tags have these around them? These brackets tell the browser that the text inside the brackets is to be read as an HTML command. So the basic skeleton of every web page looks like this (the tags will always appear in this order) and you will have one only of each of these tags on your web page): The true content of your web page starts after the HTML, HEAD and TITLE tags. The title text doesn't show up in the main browser window (where the text you are now reading is located). Look up at the top of your browser window right now.
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The document title will appear in the title bar (the bar at the top of your browser window). Generally, the title should reflect the contents of the page (like a book's title reflects the contents of the book), so you will be changing this title to better describe whatever sort of web page you are creating. The most important meta information in the HEAD tag is the tag. Information between the HEAD tags doesn't appear in the browser window, but is still important. This tells web browsers that the document is an HTML file. The never type is a subtype of, and assignable to, every type however, no type is a subtype of, or assignable to, never (except never itself).The first tag in any HTML file is the tag. Variables also acquire the type never when narrowed by any type guards that can never be true. The never type represents the type of values that never occur.įor instance, never is the return type for a function expression or an arrow function expression that always throws an exception or one that never returns. Union types are an advanced topic that we’ll cover in a later chapter.Īs a note: we encourage the use of strictNullChecks when possible, but for the purposes of this handbook, we will assume it is turned off. In cases where you want to pass in either a string or null or undefined, you can use the union type string | null | undefined. However, when using the strictNullChecks flag, null and undefined are only assignable to unknown, any and their respective types (the one exception being that undefined is also assignable to void). That means you can assign null and undefined to something like number. By default null and undefined are subtypes of all other types.