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Enable an extra set of restrictions for the content in an <iframe> in HTML?
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How to set the number of rows a table cell should span in HTML?
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How to specify that the styles only apply to this element's parent element and that element's child elements in HTML?
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How do we specify whether a header cell is a header for a column, row, or group of columns or rows in HTML?
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How to specify that an option should be pre-selected when the page loads in HTML?
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Set the shape of the area in HTML
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Execute a script when the element loses focus in HTML?
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Execute a script when a file is ready to start playing in HTML?
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How to specify the number of visible options for <select> in HTML?
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How do we set what value is the optimal value for the gauge in HTML?
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How to display a short hint that describes the expected value of the element in HTML?
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How to add a regular expression that an <input> element's value is checked against in HTML?
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How do we set an image to be shown while the video is downloading in HTML?
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How to specify if and how the author thinks the audio/video should be loaded when the page loads in HTML?
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How to specify that the element is read-only in HTML?
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Set the relationship between the current document and the linked document in HTML
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How to specify that the element must be filled out before submitting the form in HTML?
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How do we specify that the list order should be descending (9,8,7, 6, 5...) in HTML?
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Execute a script when the element is invalid in HTML?
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How do we set what media/device the linked document is optimized for in HTML?