Javascript

Loops offer a quick and easy way to do something repeatedly. This chapter of the JavaScript Guide introduces the different iteration statements available to JavaScript. You can think of a loop as a computerized version of the game where you tell someone to take X steps in one direction, then Y steps in another. For example, the idea "Go five steps to the east" could be expressed this way as a loop: 먹튀검증 for (let step = 0; step < 5; step++) { // Runs 5 times, with values of step 0 through 4. console.log('Walking east one step'); } There are many different kinds of loops, but they all essentially do the same thing: they repeat an action some number of times. (Note that it's possible that number could be zero!) The various loop mechanisms offer different ways to determine the start and end points of the loop. There are various situations that are more easily served by one type of loop over the others. The statements for loops provided in JavaScript are: for statement do...while statement while statement labeled statement break statement continue statement for...in statement for...of statement

JavaScript programs started off pretty small — most of its usage in the early days was to do isolated scripting tasks, providing a bit of interactivity to your web pages where needed, so large scripts were generally not needed. Fast forward a few years and we now have complete applications being run in browsers with a lot of JavaScript, as well as JavaScript being used in other contexts (Node.js, for example). It has therefore made sense in recent years to start thinking about providing mechanisms for splitting JavaScript programs up into separate modules that can be imported when needed. Node.js has had this ability for a long time, and there are a number of JavaScript libraries and frameworks that enable module usage (for example, other CommonJS and AMD-based module systems like RequireJS, and more recently Webpack and Babel).먹튀검증 The good news is that modern browsers have started to support module functionality natively, and this is what this article is all about. This can only be a good thing — browsers can optimize loading of modules, making it more efficient than having to use a library and do all of that extra client-side processing and extra round trips.

JavaScript is a bit confusing for developers experienced in class-based languages (like Java or C++), as it is dynamic and does not provide a class implementation per se (the class keyword is introduced in ES2015, but is syntactical sugar, JavaScript remains prototype-based).
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When it comes to inheritance, JavaScript only has one construct: objects. Each object has a private property which holds a link to another object called its prototype. That prototype object has a prototype of its own, and so on until an object is reached with null as its prototype. By definition, null has no prototype, and acts as the final link in this prototype chain.

Nearly all objects in JavaScript are instances of Object which sits on the top of a prototype chain.

While this confusion is often considered to be one of JavaScript's weaknesses, the prototypal inheritance model itself is, in fact, more powerful than the classic model. It is, for example, fairly trivial to build a classic model on top of a prototypal model.

Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in HTML or XML (including XML dialects such as SVG, MathML or XHTML). CSS describes how elements should be rendered on screen, on paper, in speech, or on other media.먹튀검증

CSS among the core languages of the open Web and is standardized across Web browsers according to the W3C specification. Previously development of various parts of CSS specification was done synchronously, which allowed versioning of the latest recommendation. You might have heard about CSS1, CSS2.1, CSS3. However, CSS4 has never become an official version.

From CSS3, the scope of the specification increased significantly and the progress on different CSS modules started to differ so much, that it became more effective to develop and release recommendations separately per module. Instead of versioning the CSS specification, W3C now periodically takes a snapshot of the latest stable state of the CSS specification.

Cascading Style Sheets (CSS)
Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in HTML or XML (including XML dialects such as SVG, MathML or XHTML). CSS describes how elements should be rendered on screen, on paper, in speech, or on other media.<a href="https://www.drmt.kr">먹튀검증</a>

CSS among the core languages of the open Web and is standardized across Web browsers according to the W3C specification. Previously development of various parts of CSS specification was done synchronously, which allowed versioning of the latest recommendation. You might have heard about CSS1, CSS2.1, CSS3. However, CSS4 has never become an official version.

From CSS3, the scope of the specification increased significantly and the progress on different CSS modules started to differ so much, that it became more effective to develop and release recommendations separately per module. Instead of versioning the CSS specification, W3C now periodically takes a snapshot of the latest stable state of the CSS specification.

Effects of the containing block
Before learning what determines the containing block of an element, it's useful to know why it matters in the first place.

The size and position of an element are often impacted by its containing block. Percentage values that are applied to the width, height, padding, margin, and offset properties of an absolutely positioned element (i.e., which has its position set to absolute or fixed) are computed from the element's containing block.

Identifying the containing block
The process for identifying the containing block depends entirely on the value of the element's position property:먹튀검증

If the position property is static, relative, or sticky, the containing block is formed by the edge of the content box of the nearest ancestor element that is either a block container (such as an inline-block, block, or list-item element) or establishes a formatting context (such as a table container, flex container, grid container, or the block container itself).
If the position property is absolute, the containing block is formed by the edge of the padding box of the nearest ancestor element that has a position value other than static (fixed, absolute, relative, or sticky).
If the position property is fixed, the containing block is established by the viewport (in the case of continuous media) or the page area (in the case of paged media).
If the position property is absolute or fixed, the containing block may also be formed by the edge of the padding box of the nearest ancestor element that has the following:
A transform or perspective value other than none
A will-change value of transform or perspective
A filter value other than none or a will-change value of filter (only works on Firefox).
A contain value of paint (e.g. contain: paint;)
Note: The containing block in which the root element (<html>) resides is a rectangle called the initial containing block. It has the dimensions of the viewport (for continuous media) or the page area (for paged media).

Effects of the containing block
Before learning what determines the containing block of an element, it's useful to know why it matters in the first place.

The size and position of an element are often impacted by its containing block. Percentage values that are applied to the width, height, padding, margin, and offset properties of an absolutely positioned element (i.e., which has its position set to absolute or fixed) are computed from the element's containing block.

Identifying the containing block
The process for identifying the containing block depends entirely on the value of the element's position property:<a href="https://www.drmt.kr">먹튀검증</a>

If the position property is static, relative, or sticky, the containing block is formed by the edge of the content box of the nearest ancestor element that is either a block container (such as an inline-block, block, or list-item element) or establishes a formatting context (such as a table container, flex container, grid container, or the block container itself).
If the position property is absolute, the containing block is formed by the edge of the padding box of the nearest ancestor element that has a position value other than static (fixed, absolute, relative, or sticky).
If the position property is fixed, the containing block is established by the viewport (in the case of continuous media) or the page area (in the case of paged media).
If the position property is absolute or fixed, the containing block may also be formed by the edge of the padding box of the nearest ancestor element that has the following:
A transform or perspective value other than none
A will-change value of transform or perspective
A filter value other than none or a will-change value of filter (only works on Firefox).
A contain value of paint (e.g. contain: paint;)
Note: The containing block in which the root element (<html>) resides is a rectangle called the initial containing block. It has the dimensions of the viewport (for continuous media) or the page area (for paged media).