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#css CSS Variables You can create and use variables in CSS. Variables allow you to change multiple values ​​at once. Variable declaration --variable-name: value; When you define a variable, you can use it in the element that defined the variable and its child elements. To make it available everywhere: Define as root. Use of variables property: var( --variable-name ) example Basic Use the variabl..

#CSS inheritance CSS attributes are inherited, not inherited. Inheriting properties affects child elements. Non-inherited attributes do not affect child elements. Inheriting attributes For example, color is an inherited property. The color specified in the parent element is also applied to the child element. in short Lorem Ipsum At this time, not only Lorem but also Ipsum will be blue. Attribute..

#javascript The Cpmparison Operator is used to compare the value of a variable with any value or other variable. There are eight comparison operators, but let's take a look at the meaning of each operator. == == is "same". True if the values ​​are equal regardless of variable type. in short 5 == 5 The above content is also correct '5' == 5 The above content is also correct != ! = Is "not the sam..

#Javascript String To use a string as the value of a variable, enclose it in single quotes (') or double quotes ("). var jb = 'Lorem ipsum dolor'; var jb = "Lorem ipsum dolor"; If the string has single quotes, enclose it in double quotes, and if there are double quotes, enclose it in single quotes. var jb = 'Lorem "ipsum" dolor.'; var jb = "Lorem 'ipsum' dolor."; If you have single and double qu..

#css If CSS defines the same attribute multiple times, the value set later will be applied. To prevent later settings from being applied, add! Important after the attribute value. property: value !important; For example, next time the last set color value is blue, so ignore red and make the paragraph text color blue. p { color: red; } p { color: blue; } But next time there is a! Important in red..

#jQuery :empty : Empty is a selector that selects empty elements with no content. grammar $( ':empty' ) for example $( 'div:empty' ) Select the div element that has no content. example jQuery Selector - :empty Lorem Ipsum Dolor Here is an example of adding an N / A string to a cell that has no table contents.

#jQuery :contains() : contains () is a selector that selects elements that contain a particular string. grammar $( ':contains(text)' ) Keep in mind that it is case sensitive when choosing whether to include strings. for example $( 'p:contains("ab")' ) Select the p element that contains the ab string. example Lorem ipsum dolor sit amet. Aenean nec mollis jb nulla. Phasellus JB lacinia tempus maur..

#jQuery :button : Button is a selector that selects the element whose type is button. grammar $( ':button' ) Selects all elements whose type is button. $( '.xy:button' ) Select an element whose type is button and whose class value is xy. example Italics the text of the element whose type is button, the class value is ab, and the text color of the element whose type is button is red.

#jQuery Using jQuery may conflict with other libraries. There are two causes of collision. 1.Conflict with other libraries 2.Conflicts with other versions of jQuery Let's see how we can prevent collisions in each case. Conflict with other libraries jQuery uses $ as an alias for jQuery. However, if you use $ as a function or variable in other libraries, jQuery may not work properly. The way to pr..

#jQuery Link with HTML document Use a CDN Add the following code to your HTML document. 3.3.1 is the version. If you want to use a different version, change the number. Download and connect Click here to download jQuery. Some files are compressed and some are uncompressed. Then add the following code to your HTML document. Change the path and file name appropriately. use jQuery The following is ..