What I've learned

1.JS : event.target;과 event.currentTarget;

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2.CSS : Peusdo-Element Selector

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3.JS : var, let, const?

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4.JS : Hoisting과 var, let, const

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5.JS : Array. method

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6.JS : Classes

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7.HTTP

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8.Dev Tools

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9.JS : Null vs Undefined

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10.JS : Object

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11.CSS : display: none;과 visibility: hidden;

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12.CSS : small TIP

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13.Semantic Web, Semantic Tag

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14.CSS : float

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15.CSS : position -relative, absolute, fixed

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16.JS : 삼항연산자

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17.Html : <button>과 <input type="button">

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18.Framework? Library?

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19.JS : allow function

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20.React : Intro

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21. JS : Callback 함수

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