lcp/index.html at main · ui-kimjisu/lcp · GitHub

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<!DOCTYPE html>
<html lang="ko">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>LCP - BEFORE</title>
    <!-- 1. 웹 폰트 preconnect / CSS preload -->
    <!-- crossorigin : 해당 요소에 링크된 외부 출처의 리소스와 현재 웹 페이와의 상호작용을 할 수 있도록  CORS(교차 출처 리소소 공유, Cross-Origin Resource Sharing)를 설정하는 속성 -->
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link rel="preload" as="style" href="https://fonts.googleapis.com/css2?family=Noto+Sans+KR&display=swap" onload="this.onload=null;this.rel='stylesheet'">


    <!-- 2.normalize 삭제 -->
    <!-- <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.1/normalize.css"> -->

     <!-- 3. 이미지 preload -->
    <link rel="preload" as="image" media="(max-width:640px)" href="https://naradesign.github.io/html5/img/small.avif">
    <link rel="preload" as="image" media="(min-width:641px)" href="https://naradesign.github.io/html5/img/large.avif">
    <style>
        body { font-family: 'Noto Sans KR', sans-serif; }
        .img {
            display: block;
            max-width: 100%;
            height: auto;
        }
        .space {
            height: 300vh;
            text-align:center;
            background:linear-gradient(#ddd 100vh, transparent 100vh) 0 0 / 100vw 200vh repeat-y
        }
    </style>
    <!-- 4. 제이쿼리 라이브러리 삭제 -->
    <!-- <script src="https://code.jquery.com/jquery-3.6.0.js"></script> -->
</head>
<body>
    <h1>LCP 문제 해결하기</h1>
    <p>이 페이지는 웹 사이트의 <a href="//web.dev/lcp/">LCP(Largest Contentful Paint)</a> 문제를 유발하는 큰 이미지를 포함하고 있다. 구글 크롬 <a href="//developers.google.com/web/tools/lighthouse">라이트하우스</a> 또는 <a href="//developers.google.com/speed/pagespeed/insights/?hl=ko">페이지 스피드 인사이트</a>를 통해 LCP 문제를 확인하고 개선해 보자. 이 문제를 해결하면 <a href="//developers.google.com/search/docs/guides/page-experience?hl=ko">고급 검색엔진 최적화</a>에 도움이 된다.</p>
    <!-- 5. 이미지 picture 작성: 지원하는 확장자별 이미지, 디바이스별 제공 이미지 -->
    <picture class="picture">
        <source srcset="https://naradesign.github.io/html5/img/small.avif" type="image/avif" media="(max-width:640px)">
        <source srcset="https://naradesign.github.io/html5/img/large.avif" type="image/avif">
        <source srcset="https://naradesign.github.io/html5/img/small.webp" type="image/webp" media="(max-width:640px)">
        <source srcset="https://naradesign.github.io/html5/img/large.webp" type="image/webp">
        <img class="img" src="https://naradesign.github.io/html5/img/small.jpg" decoding="async" alt>
    </picture>
    <p class="space">...</p>
    <!-- 6. 레이지로딩, 이미지 디코딩 병렬처리 -->
    <picture class="picture">
        <source srcset="https://naradesign.github.io/html5/img/example.avif" type="image/avif">
        <source srcset="https://naradesign.github.io/html5/img/example.webp" type="image/webp">
        <img class="img" src="https://naradesign.github.io/html5/img/example.jpg" loading="lazy" decoding="async" alt>
    </picture>
    <!-- 7. 제이쿼리삭제 -->
    <!-- <script>
        jQuery(function($){
            $('img').eq(0).attr('src', 'https://naradesign.github.io/html5/img/large.jpg')
            $('img').eq(1).attr('src', 'https://naradesign.github.io/html5/img/example.jpg')
        })
    </script> -->
</body>
</html>