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You've received an HTML file from a colleague with commented sections. What considerations might you take into account before removing these comments?

  • All images within comments are to be deleted as well. 
  • Check if the comments contain any crucial information or TODOs. 
  • Confirm with the colleague the purpose of the comments. 
  • Ensure backups exist before making changes. 
Before removing any comments, it's vital to understand their purpose. Some comments may contain important information, potential improvements (TODOs), or even explanations of complex code sections. Always make sure that you're not removing information that might be valuable later. 
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The HTML element _______ is a common example of block-level elements.

Block-level elements create a new block or a line break in the flow of content. They often represent the structural parts of a page. The

element is a widely used block-level element that acts as a container for other content, making it easier to style or script multiple elements collectively. 
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What happens when the "required" attribute is used in an input field?

  • It changes the background color of the input field. 
  • It enables the autocomplete feature. 
  • It forces the browser to check the input field for a value before submitting. 
  • It sets a default value for the input field. 
The "required" attribute enforces that an input field must be filled out before submitting a form. When a form is submitted, if a field with the "required" attribute does not have a value, the browser will block the submission and notify the user of the mandatory field. It ensures that crucial information isn't left out. 
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Your embedded YouTube video is not displaying on the webpage. How would you troubleshoot and resolve this issue?

  • Always use fullscreen mode for embedding. 
  • Check if the video URL is restricted or set to private on YouTube. 
  • Embed the video using a different website. 
  • Update the browser to the latest version. 
It's essential first to check the accessibility of the video directly on YouTube. If a video is set to private or is restricted, it won't display on external sites. Ensuring the video's availability and using the correct embedding code provided by YouTube will typically resolve this issue. Moreover, checking permissions and restrictions is a fundamental step in troubleshooting content issues. 
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How does the vertical-align property affect inline and inline-block elements?

  • It changes the height of the elements. 
  • It adjusts the position of the element relative to the baseline of its parent. 
  • It sets the horizontal alignment of the element. 
  • It defines the z-index of the element. 
The vertical-align property in CSS is used to adjust the vertical positioning of an inline or inline-block element relative to the baseline of its parent or the surrounding text. Options include values like top, middle, bottom, baseline, etc. For example, if an inline image sits lower than the text you want it aligned with, you might use the vertical-align property to adjust its position. 
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The CSS _______ property is used to set the horizontal alignment of inline-block and inline elements.

  • float 
  • horizontal-align 
  • justify 
  • text-align 
The text-align property in CSS is employed to define the horizontal alignment of content. It works not only for text but also for inline-block and inline elements. Possible values include left, right, center, and justify. This property is especially useful when trying to design web pages that are responsive and adapt well to different screen sizes. 
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How does commenting in HTML differ from XML?

  • Both use . 
  • HTML uses /* */ and XML uses . 
  • HTML uses // and XML uses . 
  • HTML uses and XML uses /* */. 
Both HTML and XML use the same syntax for commenting, which is . However, the context in which they're used differs. While HTML is primarily used for web content structuring, XML is a markup language that defines rules for encoding documents in a format that both humans and machines can read. 
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To create a dropdown list in a form, use the ______ tag.

  •  
  • tag. This tag can contain multiple
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Can an HTML document validate without a DOCTYPE declaration?

  • No, because the validator won't know the HTML version. 
  • No, unless it's an older version of HTML. 
  • Yes, but only if it's an XML document. 
  • Yes, if it uses default HTML tags. 
A DOCTYPE declaration is essential for an HTML document to validate correctly. Without it, validation tools won't know which version of HTML or XHTML the document is using. Consequently, the document cannot be checked against a specific set of rules or standards. While a document might appear fine in some browsers even without a DOCTYPE, it's essential for ensuring the document adheres to web standards and is displayed consistently across all browsers. 
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How does the "async" attribute affect script loading and execution?

  • It allows the script to be executed as soon as it’s available, without waiting for the page to be loaded. 
  • It forces the script to load synchronously. 
  • It makes the script execution wait for the DOM to be parsed. 
  • It stops the script from loading until all other resources are loaded. 
The "async" attribute allows the script to be fetched in the background without blocking the parsing of the HTML document. Once the script is available, it's executed immediately, without waiting for the entire page to be loaded. This can improve performance but also means that the script might be executed before the DOM is fully parsed. 
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