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What should a developer correct before revalidating after a code validator reports multiple errors in code?
A. The first reported error
B. Only JavaScript errors
C. Only CSS errors
D. The last reported error
Answer: A
Explanation:
When using a code validator to check your HTML, CSS, or JavaScript code, it's essential to address errors in a systematic manner. The correct approach is to correct the first reported error before revalidating. This method is recommended because often, the first error can cause a cascade of subsequent errors or warnings.
By fixing the first error, you may automatically resolve other errors that were reported later.
* Reasoning:
* Cascading Errors: The first error in the code might lead to multiple subsequent errors. Fixing it can sometimes resolve those cascading errors, reducing the overall number of errors in the next validation.
* Logical Flow: Addressing errors in the order they appear maintains a logical flow and makes debugging more manageable.
* Steps to Follow:
* Step 1: Run the code through the validator.
* Step 2: Identify the first reported error.
* Step 3: Correct the first error.
* Step 4: Revalidate the code to check if the error count has reduced or if new errors appear.
* Step 5: Repeat the process until all errors are resolved.
* References:
* W3C Markup Validation Service
* MDN Web Docs - Debugging HTML
* W3C CSS Validation Service
NEW QUESTION # 28
Given the following HTML statement:
And the following style:
Which line of the changes the background color of the <div> tag when the width is between 600 pixels and
900 pixels or more than 1, 100 pixels?
A.
B.
C.
D.
Answer: C
Explanation:
The given HTML and CSS statements define a class named "example" and use media queries to change the background color of the<div>element based on the screen width. The correct CSS media query to change the background color of the<div>tag when the width is between 600 pixels and 900 pixels or more than 1100 pixels is:Copy code
@media screen and (max-width: 900px) and (min-width: 600px), (min-width: 1100px) { div.example { background: yellow;
}
}
* Understanding Media Queries:
* @media screen: Applies the styles only for screens.
* (max-width: 900px) and (min-width: 600px): Targets screen widths between 600 and 900 pixels.
* ,(comma): Acts as an "or" operator in media queries.
* (min-width: 1100px): Targets screen widths greater than or equal to 1100 pixels.
* Option C Explanation:
* This option uses the correct media query syntax to apply the background color change when the screen width is between 600 and 900 pixels or when it is 1100 pixels or more.
:
MDN Web Docs on Media Queries
W3C CSS Media Queries Level 4
The correct CSS media query based on the provided options is:
@media screen and (max-width: 900px) and (min-width: 600px), (min-width: 1100px) { div.example { background: yellow;
}
}
References for Media Queries:
MDN Web Docs on Using Media Queries
W3C CSS Media Queries Module Level 4
NEW QUESTION # 29
Given the following markup and no style sheet:
Which control does the input element render?
A. Button
B. Drop-down
C. Text
D. Slider
Answer: D
Explanation:
The type="range" attribute in an <input> element renders a slider control.
* HTML Input Type range:
* Purpose: The range type is used for input fields that should contain a value from a range of numbers.
* Example:
* Given the HTML:
<input id="range" name="range" type="range">
* Explanation:
* This will render as a slider that the user can move to select a value within a range.
* References:
* MDN Web Docs - <input type="range">
* W3Schools - HTML Input Range
NEW QUESTION # 30
What does declaring <!DOCTYPE html> indicate to the browser?
A. The code is written in HTML4.
B. The code is written in HTML5.
C. The file extension is HTML5.
D. The file extension is HTML4.
Answer: B
Explanation:
From the W3C HTML5 Recommendation, section "2.5 The DOCTYPE":
"A DOCTYPE is a required preamble. DOCTYPEs are required for legacy reasons. When omitted, browsers tend to use a different rendering mode that is incompatible with some specifications. Including the DOCTYPE in a document ensures that the browser makes a best-effort attempt at following the relevant specifications.
A DOCTYPE must consist of the following components, in this order:
* The string <!DOCTYPE (case-insensitive).
* One or more whitespace characters.
* The string html (case-insensitive).
* Optionally, a legacy DOCTYPE string.
* Zero or more whitespace characters.
* A > character.
In other words, <!DOCTYPE html> exactly."
And from MDN Web Docs' "<!DOCTYPE>" entry:
"The <!DOCTYPE html> declaration informs the browser that the page is written in HTML5 and that it should be rendered in standards mode (instead of quirks mode). It is the simplest, case-insensitive form of DOCTYPE defined by HTML5." Together, these extracts confirm that <!DOCTYPE html> tells the browser the document uses HTML5 and directs it to render according to the HTML5 (standards) specification rather than falling back to legacy rendering modes.
References:
W3C HTML5 Recommendation, section "2.5 The DOCTYPE"
MDN Web Docs: "<!DOCTYPE>"
NEW QUESTION # 31
Given the following CSS margin shorthand property:
```css
p {
margin: 10px 20px 25px 30px;
}
```
How many pixels is the top margin?
A. 30px
B. 10px
C. 25px
D. 20px
Answer: B
Explanation:
> "When using the `margin` shorthand with four values:
>
> * The first value is the top margin
> * The second is the right margin
> * The third is the bottom margin
> * The fourth is the left margin"
So, `margin: 10px 20px 25px 30px;` translates to:
* top: 10px
* right: 20px
* bottom: 25px
* left: 30px
References:
* MDN Web Docs: margin shorthand property
* CSS Logical Properties specification
---
NEW QUESTION # 32
......
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