質問編集履歴
1
<code>の追加
test
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File without changes
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test
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@@ -10,13 +10,21 @@
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### 発生している問題・エラーメッセージ
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13
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```HTML
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13
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-
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15
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Uncaught TypeError: Cannot set property 'height' of undefined
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at effect (study.html:9)
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at HTMLInputElement.onclick (study.html:15)
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```
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### 該当のソースコード
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```HTML
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<!DOCTYPE html>
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<html>
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@@ -24,17 +32,15 @@
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<meta charset="utf-8">
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<link rel="stylesheet" href="css/study.css">
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<title></title>
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<script type="text/javascript">
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function effect(){
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var header_height=document.getElementsByTagName('header');
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var header_height=document.getElementsByTagName('header');
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header_height.style.height='500px';
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header_height.style.height='500px';
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}
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@@ -62,6 +68,10 @@
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</html>
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```
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### 試したこと
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67
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### 補足情報（FW/ツールのバージョンなど）
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