코딩 중 에러/경고 표시가 갑자기 100여개로 늘어났습니다.

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코딩 중 에러/경고 표시가 갑자기 100여개로 늘어났습니다.

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* 겪고 있는 문제 상황을 최대한 자세하게 작성해주세요.

* 문제 해결을 위해 어떤 시도를 해보았는지 구체적으로 함께 알려주세요.

키보드 단축키를 잘못 눌렀는지 갑자기 코드에서 에러/경고 표시가 크게 늘어났습니다.

설정에서 무엇이 잘못되었는지 찾아봤으나 찾지를 못했습니다.

<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"
        integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"
        integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM"
        crossorigin="anonymous"></script>

    <title>스파르타코딩클럽 | 부트스트랩 연습하기</title>
    <link href="https://fonts.googleapis.com/css2?family=Gowun+Dodum&display=swap" rel="stylesheet">
    <style>
        * {
           font-family: 'Gowun Dodum', sans-serif;
        }
        .mytitle {
            /*background-color: green;*/
            height: 250px;
            width: 100%;

            background-image: linear-gradient(0deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url("https://movie-phinf.pstatic.net/20210715_95/1626338192428gTnJl_JPEG/movie_image.jpg");
            background-position: center;
            background-size: cover;

            color: white;

            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }
        .mytitle > button {
            width: 200px;
            height: 50px;

            background-color: transparent;
            color: white;

            border-radius: 50px;
            border: 1px solid white;
            margin-top: 10px;
        }
        .mytitle > button:hover {
            border: 2px solid white;
        }
        .mycomment {
            color: gray;
        }
    </style>
</head>

<body>
    <div class="mytitle">
        <h1>내 생애 최고의 영화들</h1>
        <button>영화 기록하기</button>
    </div>
    <div class="row row-cols-1 row-cols-md-4 g-4">
        <div class="col">
            <div class="card">
                <img src="https://movie-phinf.pstatic.net/20210728_221/1627440327667GyoYj_JPEG/movie_image.jpg" class="card-img-top" alt="...">
                <div class="card-body">
                    <h5 class="card-title">여기에 제목이 들어갑니다.</h5>
                    <p class="card-text">여기에 내용이 들어가지요.</p>
                    <p>⭐⭐⭐</p>
                    <p class="mycomment">여기에 코멘트가 들어갑니다.</p>
                </div>
            </div>
        </div>
        <div class="col">
            <div class="card">
                <img src="..." class="card-img-top" alt="...">
                <div class="card-body">
                    <h5 class="card-title">Card title</h5>
                    <p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional
                        content. This content is a little bit longer.</p>
                </div>
            </div>
        </div>
        <div class="col">
            <div class="card">
                <img src="..." class="card-img-top" alt="...">
                <div class="card-body">
                    <h5 class="card-title">Card title</h5>
                    <p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional
                        content.</p>
                </div>
            </div>
        </div>
        <div class="col">
            <div class="card">
                <img src="..." class="card-img-top" alt="...">
                <div class="card-body">
                    <h5 class="card-title">Card title</h5>
                    <p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional
                        content. This content is a little bit longer.</p>
                </div>
            </div>
        </div>
    </div>
</body>

</html>

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