OOQ

#css :empty :empty selects empty elements with no content. For example, the following selects li elements with no content: li:empty Blanks are assumed to have content. So having an empty space like this will not be selected: :first-child :first-child selects the first of its sibling elements. :hover :hover selects the state where the mouse hovers over the element. For example, the following will..

#css Pseudo-elements select specific parts of an element. ::first-line ::first-line selects the first line of the element. For example, the following sets the text color of the first line of the p element to red. p::first-line { color: red; } ::first-letter ::first-letter selects the first letter of the element. For example, the following sets the color of the first letter of the p element to re..

#css Adjacent Sibling Selector (Adjacent Sibling Selector) The Adjacent Sibling Selector selects the first element of any element's sibling element. For example, the following selects the first p element siblings of the h1 element. h1 + p #css grammar #css basic #css tag #css Adjacent Sibling Selector #Adjacent Sibling Selector #selector #css selector

#css Sibling Selector (Sibling Selector) A sibling selector is a selector that selects the siblings of any element. For example, the following selects the p element among the sibling elements of the h1 element. h1 ~ p #css grammar #css basic #css tag #css Sibling Selector #Sibling Selector #selector #css selector

#php #PHP/operators/logical operators $a and $b Returns TRUE if both $a and $b are TRUE. $a or $b Returns TRUE if $a or $b is TRUE. Note that if both are TRUE, it is also TRUE. That is, FALSE only if both are FALSE. $a x or $b Returns TRUE only if either $a or $b is TRUE. ! $a Returns TRUE if $a is not TRUE. $a && $b Returns TRUE if both $a and $b are TRUE. $a || $b Returns TRUE if $a or $b is T..

#css Child Selector (Child Selector) A child selector selects the child elements of a particular element. For example, the following selects blockqoute among the child elements of the div element. div > blockquote The caveat is that you only select elements that are one step down. In other words, choose blockquote when: ... Don't choose blockquote if: ... #css grammar #css basic #css tag #css ch..

#php #PHP/operators/increase operator, decrease operator ++$a Returns $a after increasing the value. for example $a = 1; echo ++$a; will output 2. $a++ After returning $a , increment the value. for example $a = 1; echo $a++; will output 1 and the value of $a will be 2. --$a Returns $a after decrementing the value. for example $a = 1; echo --$a; will output 0. $a-- Decrease the value after return..

#HTML #pre #tag to output as you type pre HTML recognizes multiple consecutive spaces, tabs, and line breaks as a single space. For example, the content of the following document is displayed on one line: Lorem ipsum dolor. Lorem ipsum dolor. Lorem ipsum dolor. To output as you type, use the pre tag. The default font is fixed width font. Lorem ipsum dolor. Lorem ipsum dolor. Lorem ipsum dolor. a..

#HTML #em,strong #highlight text, important text em, strong The em tag is used for emphasized text. The basic form is italic. Use the strong tag for important text. The basic shape is bold. example Lorem Ipsum Dolor. TIP The b tag makes the text bold. The difference from strong is that it is thickened without adding meaning.

#javascript #JavaScript / array (Array) / declare How to declare an array Method1 Create an array named jbAry. var jbAry = new Array(); assign a value. jbAry[0] = 'Lorem'; jbAry[1] = 'Ipsum'; jbAry[2] = 'Dolor'; Method2 var jbAry = [ 'Lorem', 'Ipsum', 'Dolor' ]; Method3 var jbAry = new Array( 'Lorem', 'Ipsum', 'Dolor' ); example This is an example of assigning values ​​to an array and then outpu..