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启用对中的内容实行额外的限制in HTML?</a> </h3> <div class="qa_category" id="tags_6985"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/Giri-Raju" title="Giri Raju"><img src="https://tutorialspoint.com/assets/profiles/13536/profile/60_72105-1512540773.jpg" alt="Giri Raju"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/Giri-Raju" title="Giri Raju">Giri Raju</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 01-Jun-2020 08:49:32 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 0 Views</p> </div> <div class="clear"></div> <p>Use the sandbox attribute to enable an extra set of restrictions for the content in an in HTML.ExampleYou can try to run the following code to implement sandbox attribute − Your browser does not support iframes. </p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="google_content_ads"> <div style="text-align: center;"> <div id="ezoic-pub-ad-placeholder-133"></div> <script> ezstandalone.cmd.push(function() { ezstandalone.showAds(133); }); </script> </div> </div> </div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-do-we-set-the-visible-number-of-lines-in-a-text-area-in-HTML" target="_blank"> How do we set the visible number of lines in a text area in HTML?</a> </h3> <div class="qa_category" id="tags_6984"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 15-Dec-2022 12:39:02 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 4K+ Views</p> </div> <div class="clear"></div> <p>This article will teach you how do we set the visible number of lines in a textarea in HTML. The HTML element is useful for multi-line editing control and allows the user to enter a sizeable amount of free-form text. Syntax Following is the syntax to set the visible number of lines in text area − To display the number of rows, or number of visible text lines for the control, is specified using the HTML textarea rows attribute. Additionally, it specifies the textarea’s visible height. Following are the examples to set the visible number of lines ... <a href="https://tutorialspoint.com/How-do-we-set-the-visible-number-of-lines-in-a-text-area-in-HTML"><span class="read_more">Read More <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/Execute-a-script-when-the-element-is-invalid-in-HTML" target="_blank"> Execute a script when the element is invalid in HTML?</a> </h3> <div class="qa_category" id="tags_6983"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 15-Dec-2022 12:39:56 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 242 Views</p> </div> <div class="clear"></div> <p>In this article we are running a script when the element is invalid in HTML.as we are familiar with the tag and element. HTML element To gather user input, an HTML form is utilised. Most frequently, a server processes the user input. ……. HTML tag The tag designates a field for user-enterable data. The most significant form element is the element. Depending on the type attribute, the element can be presented in a number of different ways. When a submittable element is ... <a href="https://tutorialspoint.com/Execute-a-script-when-the-element-is-invalid-in-HTML"><span class="read_more">Read More <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-specify-that-the-element-must-be-filled-out-before-submitting-the-form-in-HTML" target="_blank"> How to specify that the element must be filled out before submitting the form in HTML?</a> </h3> <div class="qa_category" id="tags_6981"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/Vanithasree" title="vanithasree"><img src="https://tutorialspoint.com/assets/profiles/13547/profile/60_85216-1512542720.jpg" alt="vanithasree"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/Vanithasree" title="vanithasree">vanithasree</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 03-Mar-2020 11:05:03 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 680 Views</p> </div> <div class="clear"></div> <p>The required attribute in HTML is used to specify that the element should be filled before the form is submitted. If the field is not filled and the submit button is clicked, an error generates, which fails form submission. The error will be “Please fill out this field”.The required attribute can be used on input, select and textarea element.ExampleYou can try to run the following code to implement readonly attribute − HTML placeholder attribute Register </p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/Set-the-relationship-between-the-current-document-and-the-linked-document-in-HTML" target="_blank"> Set the relationship between the current document and the linked document in HTML</a> </h3> <div class="qa_category" id="tags_6980"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/Govinda-Sai" title="Govinda Sai"><img src="https://tutorialspoint.com/assets/profiles/13542/profile/60_86497-1512650655.jpg" alt="Govinda Sai"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/Govinda-Sai" title="Govinda Sai">Govinda Sai</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 03-Mar-2020 11:04:19 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 183 Views</p> </div> <div class="clear"></div> <p>Use the rel attribute to see the relationship between the current document and the linked document. It works for , , HTML elements. ExampleYou can try to run the following code to implement rel attribute. The example sets the CSS files − Heading This is demo content. </p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-specify-that-the-element-is-read-only-in-HTML" target="_blank"> How to specify that the element is read-only in HTML?</a> </h3> <div class="qa_category" id="tags_6979"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 15-Dec-2022 15:57:16 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 129 Views</p> </div> <div class="clear"></div> <p>In this article we are going to learn about how to specify if and how the authoe thinks the audio/video should be loaded when the page loads in HTML. By using the HTML Audio Preload Attribute, the author can describe how they want the audio to load when the page does. This feature allows the author to tell the browser how to implement a website's user experience. Note − The preload gets ignored when autoplay was present. Syntax Following is syntax for HTML preload attribute. For getting better understanding on how to specify if and how author thinks the audio/video ... <a href="https://tutorialspoint.com/How-to-specify-that-the-element-is-read-only-in-HTML"><span class="read_more">Read More <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="google_content_ads"> <div style="text-align: center;"> <div id="ezoic-pub-ad-placeholder-134"></div> <script> ezstandalone.cmd.push(function() { ezstandalone.showAds(134); }); </script> </div> </div> </div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-specify-if-and-how-the-author-thinks-the-audio-video-should-be-loaded-when-the-page-loads-in-HTML" target="_blank"> How to specify if and how the author thinks the audio/video should be loaded when the page loads in HTML?</a> </h3> <div class="qa_category" id="tags_6978"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/Prabhas" title="Prabhas"><img src="https://tutorialspoint.com/assets/profiles/13554/profile/60_90506-1512543588.jpg" alt="Prabhas"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/Prabhas" title="Prabhas">Prabhas</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 24-Jun-2020 11:48:24 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 89 Views</p> </div> <div class="clear"></div> <p>You can try to run the following code to learn how to implement a preload attribute to allow the author to give a hint to the browser for the best user experience. Works for both and tags −Example Your browser does not support the video element. </p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-do-we-set-an-image-to-be-shown-while-the-video-is-downloading-in-HTML" target="_blank"> How do we set an image to be shown while the video is downloading in HTML?</a> </h3> <div class="qa_category" id="tags_6977"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 15-Dec-2022 15:39:43 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 252 Views</p> </div> <div class="clear"></div> <p>In this article we are going to learn about how do we set an image to be shown while the video is downloading in HTML. The HTML poster attribute allows the user to display the image when the user clicks the play button or downloads a video. Otherwise, the first frame of the video will be used as the poster image if the poster attribute was not set. Syntax Following is the syntax for HTML attribute. Let’s dive into the following example where you can understand more about HTML attribute. Example 1 In the following example ... <a href="https://tutorialspoint.com/How-do-we-set-an-image-to-be-shown-while-the-video-is-downloading-in-HTML"><span class="read_more">Read More <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-add-a-regular-expression-that-an-input-element-s-value-is-checked-against-in-HTML" target="_blank"> How to add a regular expression that an input element's value is checked against in HTML?</a> </h3> <div class="qa_category" id="tags_6976"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma"><img src="https://tutorialspoint.com/assets/profiles/511236/profile/60_1602256-1662106429.jpg" alt="Yaswanth Varma"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/yaswanth-verma" title="Yaswanth Varma">Yaswanth Varma</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 15-Dec-2022 15:38:21 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 110 Views</p> </div> <div class="clear"></div> <p>The task we are going to perform in this article is about how to add a regular expression that an input elements value is checked against in HTML. The regular expression that will be used to check the value of the input element is specified by the HTML pattern attribute. The following input kinds are compatible with this attribute: text, password, date, search, email, etc. Syntax Following is the syntax for HTML pattern attribute. For getting more idea on how to add a regular expression that an input elements value is checked against in HTML, let’s look ... <a href="https://tutorialspoint.com/How-to-add-a-regular-expression-that-an-input-element-s-value-is-checked-against-in-HTML"><span class="read_more">Read More <i class="fal fa-long-arrow-right"></i></span></a></p> </div> </div> </div> <div class="clear"></div> <div class="question_section"> <div class="qa_widget"> <div class="qa_post qa_list"> <h3> <a href="https://tutorialspoint.com/How-to-display-a-short-hint-that-describes-the-expected-value-of-the-element-in-HTML" target="_blank"> How to display a short hint that describes the expected value of the element in HTML?</a> </h3> <div class="qa_category" id="tags_6975"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <div class="qa_answer_widget"> <a href="https://tutorialspoint.com/authors/Daniol-Thomas" title="Daniol Thomas"><img src="https://tutorialspoint.com/assets/profiles/13551/profile/60_130035-1512726078.jpg" alt="Daniol Thomas"></a> <div class="qa_answer_detail"> <a href="https://tutorialspoint.com/authors/Daniol-Thomas" title="Daniol Thomas">Daniol Thomas</a> </div> <div class="flex-group"> <div class="qa_answer_dtm"> Updated on 31-May-2020 00:27:36 </div> <p class="views-count" title="Article Views"><svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M117.2 136C160.3 96 217.6 64 288 64s127.7 32 170.8 72c43.1 40 71.9 88 85.2 120c-13.3 32-42.1 80-85.2 120c-43.1 40-100.4 72-170.8 72s-127.7-32-170.8-72C74.1 336 45.3 288 32 256c13.3-32 42.1-80 85.2-120zM288 32c-80.8 0-145.5 36.8-192.6 80.6C48.6 156 17.3 208 2.5 243.7c-3.3 7.9-3.3 16.7 0 24.6C17.3 304 48.6 356 95.4 399.4C142.5 443.2 207.2 480 288 480s145.5-36.8 192.6-80.6c46.8-43.5 78.1-95.4 93-131.1c3.3-7.9 3.3-16.7 0-24.6c-14.9-35.7-46.2-87.7-93-131.1C433.5 68.8 368.8 32 288 32zM192 256a96 96 0 1 1 192 0 96 96 0 1 1 -192 0zm224 0a128 128 0 1 0 -256 0 128 128 0 1 0 256 0z"/></svg> 257 Views</p> </div> <div class="clear"></div> <p>Use the placeholder attribute in HTML to display a hint describing the expected value of the element.ExampleYou can try to run the following code to implement placeholder attribute − Login </p> </div> </div> </div> <div class="clear"></div> <div class="job-index qa_widget" style="padding:0px 10px 0px 10px!important; margin:0px!important;"> <div class="pages"> <a href="https://tutorialspoint.com/articles/category/front-end-technology/689" title="Previous Page"><i class='fal fa-angle-left'></i> Previous</a> <a class="number" title="Go to page 1 of 859" 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