Many web developers are committed to the so-called Web standards movement for a meaningful and correct use of the web techniques HTML and CSS. Content-rich, accessible and adaptable websites are the goal. In this context, the foundations for modern Javascript have also been developed. Javascript allows interactions with the user, validations of inputs and much more.
HTML defines what should be on the page (structural structure and content)
HTML documents are the basis of the World Wide Web and are represented by web browsers. HTML is a markup language based on plain text. With HTML (Hypertext Markup Language), these texts are structured in a meaningful and meaningful way, for example by identifying headings, lists, paragraphs, data tables, related areas and important sections as such. HTML is not a programming language, but a text-based description language. Text passages are distinguished using HTML elements. The elements characterize the logical meaning (semantics) of text passages within the website.
CSS defines how the websites should be displayed (formatting and design)
CSS (Cascading Style Sheets) contain the formatting information. These are used for the presentation of the HTML document. The browser displays the result of HTML and CSS. For responsive web design, so-called media queries are an essential prerequisite to allow different designs depending on certain of the available resolution. It makes the most sense to note the CSS specifications in an outsourced stylesheet. Normally, a website consists of several (often hundreds) of pages, all of which should be formatted the same. The advantage of outsourcing is that the design of a website can be changed quickly and easily centrally.
Javascript determines what should happen (behavior)
With the help of Javascript, it is possible to react dynamically to events and influence the document or display warnings. This goes beyond the possibilities offered by a word processor. For example, Javascript can be used to check whether a user meets the requirements. Or even a form can be adapted for a special case. The possibilities are limitless. The effort to realize this is rather low.
Like CSS, Javascript adds special value to the document. CSS and Javascript are to be used with the aim of improving usability for the user. Javascript is an object-oriented scripting language that can be fully programmed. It is also considered a suitable entry-level programming language, since, unlike other programming languages, it has fewer language elements and reacts quite tolerantly to small errors.
